Of all the steps in the IVF process, egg retrieval is the one that tends to generate the most anxiety — and the most questions that people are embarrassed to ask out loud. What does the procedure actually feel like? How many eggs is enough? What does the fertilization report mean? And why does everyone seem to respond so differently? This guide covers the full picture: stim injections, the trigger shot, the retrieval procedure, recovery, and how to read your numbers without spiraling.

Relevant to: anyone providing eggs in an IVF cycle, whether you're an intended mother, an egg donor, or a same-sex female couple doing reciprocal IVF. If you're a surrogate carrier, an intended parent using donor eggs, or a gay male couple using a donor, this post explains what your egg provider is going through, which is worth understanding.

Phase 1: Ovarian Stimulation ("Stims")

Ovarian stimulation — almost universally called "stims" by patients — is the 8–14 day injection phase that comes before retrieval. Normally, your body recruits a cohort of follicles each month but only one matures and ovulates. Stim medications override that process, pushing as many follicles as possible to develop simultaneously.

What medications are typically involved

FSH medications (gonadotropins): These are the main stim drugs: injectable hormones that directly stimulate follicle growth. Common brands include Gonal-F, Follistim, and Menopur. Your dose is calibrated to your ovarian reserve (AMH, AFC) and adjusted throughout the cycle based on monitoring.

GnRH antagonists (Cetrotide, Ganirelix): Added mid-cycle to prevent premature ovulation. These prevent your body from releasing the eggs before retrieval.

Trigger shot (hCG or Lupron trigger): Administered at a very precise time — typically 36 hours before retrieval — to mature the eggs and prepare them for release. This is the most time-sensitive injection of the entire process. Missing the trigger window by even a few hours can affect the outcome.

What monitoring looks like

During stims, you'll have frequent monitoring appointments — typically every 1–3 days — to track follicle growth via transvaginal ultrasound and adjust your medication dose based on bloodwork (estradiol levels). It's a lot of appointments, often early morning. This is worth knowing in advance so you can plan around work and travel.

For those using donor eggs: your egg donor goes through the stimulation protocol, not you. If you're an intended parent using a donor, you may not be present for this phase at all, though your clinic will keep you updated on how the donor's cycle is progressing.

The Trigger Shot: Why Timing Is Everything

The trigger shot is the injection that signals your eggs to undergo final maturation. It's given at a specific time — usually late at night — so that retrieval can happen exactly 35–36 hours later, just before natural ovulation would occur.

hCG trigger (Ovidrel, Pregnyl, Novarel): The traditional trigger, which mimics the LH surge that causes ovulation. Effective but carries a slightly higher OHSS risk in high-responders.

Lupron trigger (leuprolide acetate): Used more often in patients at risk for OHSS (typically those with PCOS or high follicle counts). Slightly lower OHSS risk, but requires a freeze-all cycle because it can affect luteal phase support.

The exact time of the trigger is not flexible. If your instructions say 11:00 PM, they mean 11:00 PM. Clinics are very clear about this, but it's worth emphasizing: set multiple alarms.

The Retrieval Procedure: What Actually Happens

Before you go in

You'll be told to fast (no food or water) from midnight the night before. You need a driver — you cannot drive yourself home under any circumstances after sedation. Wear comfortable clothes. Most clinics tell you to leave jewelry and contact lenses at home.

The procedure itself

Egg retrieval is done under IV sedation sometimes called "twilight anesthesia" or monitored anesthesia care (MAC). You're not fully under general anesthesia, but you're deeply sedated and won't feel or remember the procedure.

The procedure itself takes roughly 15–30 minutes. A transvaginal ultrasound probe with a thin needle guide is used to aspirate the fluid from each follicle. The embryologist in the adjacent lab immediately examines each sample for eggs. You won't be awake for any of this.

You'll wake up in a recovery area, usually within 30–45 minutes of the procedure starting. A nurse will check your vitals, give you something to drink, and let you know how many eggs were retrieved. That number — your egg count — is the first of several numbers you'll track over the coming days.

Will I be in pain?

During the procedure, no, because you're sedated. Afterward, most people describe the discomfort as cramping that ranges from mild period-like pain to something more significant. Bloating is almost universal. Some people feel mostly fine within a few hours; others spend the rest of the day on the couch. Both are normal. Over-the-counter pain relief (Tylenol, not ibuprofen — your clinic will specify) is usually sufficient.

After Retrieval: The Numbers Game

The hours and days after retrieval involve a sequence of updates that many patients find just as stressful as the procedure itself. Here's what each number means.

Eggs retrieved

This is the count of eggs aspirated from the follicles. Not every follicle contains a mature egg; typically 70–80% do. So if you had 12 follicles visible on your last ultrasound, retrieving 8–10 eggs would be a reasonable outcome.

What counts as a "good" number varies significantly by age, ovarian reserve, and clinic protocol. The SART data shows that average live birth rates per transfer are more related to embryo quality and patient age than raw egg count. Retrieving 5 eggs and getting 2 good blastocysts is often a better outcome than retrieving 20 and getting 2.

Mature eggs (MII)

Of the eggs retrieved, only mature eggs (at the MII stage of development) can be fertilized. Typically 70–80% of retrieved eggs are mature. Immature eggs can sometimes be cultured to maturity, but success rates are lower.

Fertilization report (Day 1)

You'll receive your fertilization report roughly 16–20 hours after retrieval. This tells you how many eggs fertilized normally (two pronuclei, or 2PN, meaning one from the egg and one from the sperm). Normal fertilization rates are typically 60–80% of mature eggs.

With conventional insemination: eggs and sperm are placed together and fertilization happens naturally in the dish.

With ICSI (intracytoplasmic sperm injection): a single sperm is injected directly into each mature egg. ICSI is used when sperm parameters are suboptimal, when using frozen or surgically retrieved sperm, or as standard protocol at many clinics.

Day 3 and Day 5 updates

After fertilization, embryos are cultured in the lab. Some clinics check on Day 3 (cleavage stage); most aim for Day 5 or Day 6 blastocysts, which have a significantly higher implantation potential than Day 3 embryos.

It's completely normal for the number to drop at each stage. Fertilized eggs don't all become blastocysts — typically 30–50% of fertilized eggs make it to a usable blastocyst. This is not a lab failure; it reflects the natural attrition of early embryo development, and it's the same process that occurs in natural conception.

PGT (Preimplantation Genetic Testing)

If you're doing PGT-A (aneuploidy screening), a few cells are biopsied from each blastocyst and sent to a genetics lab. Results typically take 1–2 weeks. Euploid (chromosomally normal) embryos have significantly higher implantation rates — approximately 60–70% per transfer in good-prognosis patients — compared to untested embryos.

A note on emotional math: patients often fixate on each number drop as a loss. 15 eggs → 12 mature → 9 fertilized → 5 blastocysts → 3 euploid. Each step down can feel devastating in the moment. But 3 euploid blastocysts is genuinely a very good outcome — potentially enough for multiple transfers and more than one child. It helps to hold the final number, not the journey to it.

What Nobody Warns You About

The emotional crash after retrieval

Many patients describe a significant emotional dip in the 24–48 hours after retrieval — a mix of hormonal crash (estrogen drops sharply once follicles are aspirated), physical discomfort, and the sudden shift from doing something to waiting. It can feel disproportionate. It's extremely common and worth knowing about in advance.

The fertilization report is harder to receive than expected

Most people expect to feel relief when the fertilization report comes in. Often it's the opposite: the number is lower than you hoped, or one fertilization method worked better than another, and it triggers a new round of anxiety. Prepare for this emotionally, and try to hold the number in context: it's one step in a longer process.

OHSS — ovarian hyperstimulation syndrome

OHSS occurs when the ovaries over-respond to stimulation medications, causing fluid to leak from blood vessels into the abdominal cavity. Mild OHSS (bloating, discomfort) is very common, almost universal in some form. Moderate to severe OHSS is less common but serious, and requires medical attention. Symptoms of concern include: rapid weight gain (more than 2 lbs/day), severe abdominal pain or bloating, nausea and vomiting, and shortness of breath. If any of these develop, contact your clinic immediately. The ASRM has published patient guidance on OHSS worth reading before your cycle.

The wait for PGT results

If you're doing PGT, the 1–2 week wait for genetic results can be its own kind of difficult. You know you have blastocysts — but you don't yet know which ones are viable. Many people find this period harder than the 2WW after transfer. There's no shortcut through it.

Recovery Timeline: What to Expect After Egg Retrieval

Day of retrieval You'll feel groggy from sedation, with bloating, mild to moderate cramping, and light spotting. You'll need someone to drive you home. Plan to rest for the remainder of the day. Call your clinic if: you experience severe pain, heavy bleeding, fever, or inability to urinate.

Day 1 after retrieval Bloating usually peaks on this day. Most people feel somewhere between uncomfortable and fine. Light activity is OK, but avoid strenuous exercise. Call your clinic if: pain is worsening rather than improving, you're vomiting, or you notice significant abdominal swelling.

Days 2–3 Bloating begins to ease. Most people return to desk work. You may receive your fertilization report on Day 1 or Day 2 after retrieval. Call your clinic if: symptoms aren't improving at all by Day 3.

Days 3–5 You'll get embryo development updates — a Day 3 cleavage check or Day 5 blastocyst report. Most people feel close to normal by now. Call your clinic if: any new symptoms appear. OHSS (ovarian hyperstimulation syndrome) can develop in this window.

Days 5–7 If you're doing PGT-A, embryos are biopsied and sent for genetic testing. Final results typically take one to two weeks. Call your clinic if: you notice signs of OHSS — severe bloating, rapid weight gain (more than 2 lbs/day), or shortness of breath. Seek care immediately.

Frequently Asked Questions

How long does egg retrieval take?

The procedure itself is typically 15–30 minutes. Plan to be at the clinic for 2–4 hours total, including check-in, pre-procedure prep, the retrieval, and recovery before you're cleared to leave.

Will I be awake during egg retrieval?

No. Egg retrieval is performed under IV sedation — you'll be deeply asleep and won't feel or remember the procedure. You'll wake up in a recovery area afterward.

How many eggs is a good result?

This depends heavily on your age, ovarian reserve, and what you're trying to achieve. There's no universal "good" number — what matters most is the number of euploid (chromosomally normal) blastocysts you end up with after the full process. Generally, retrieving enough eggs to produce 1–3 euploid blastocysts is considered a meaningful outcome. Your clinic can give you personalized expectations based on your specific numbers.

When do I get my fertilization report?

Typically 16–20 hours after retrieval — so if your retrieval was at 8 AM, expect the call the following morning. Some clinics send results by patient portal; others call. Ask your coordinator what to expect so you're not refreshing your phone all day.

What happens if no eggs are retrieved, or none fertilize?

This is called a cancelled cycle, and it's genuinely difficult. It's uncommon but it happens — sometimes follicles are empty, or fertilization fails entirely. Your clinic will do a thorough review to understand why and discuss next steps. A second retrieval cycle is often recommended with protocol adjustments.

Do egg donors go through the same process?

Yes — the medical experience of egg retrieval is identical for egg donors and intended mothers. The key difference is that the donor's eggs are fertilized with the intended father's or donor sperm, and the resulting embryos belong to the intended parents. Egg donors are extensively screened beforehand and closely monitored throughout.

Can same-sex female couples both do egg retrieval?

Yes — this is reciprocal IVF, and it's increasingly common. One partner provides the eggs (goes through stimulation and retrieval), and the other carries the pregnancy (receives the embryo transfer). Both partners can have their eggs retrieved and embryos created if they want genetic material from both. Each retrieval is its own full IVF cycle.

Track Your Retrieval Cycle with Zygi

The stimulation and retrieval phase involves a lot of moving parts — injection schedules, monitoring appointments, medication changes, and a stream of numbers that can feel overwhelming to keep straight. Zygi's stim phase checklist helps you track every injection, appointment, and result in one place — so you can focus on the process instead of trying to remember where you left off. Start for free at zygihealth.org.

Sources & Further Reading

• ASRM — Ovarian Hyperstimulation Syndrome (OHSS) Patient Guide
• ASRM — PGT-A Practice Guidelines
• SART — What to Expect from IVF
• CDC — ART National Summary Report
• ESHRE — Ovarian Stimulation Guidelines

This post is for informational purposes only and is not medical, legal, or financial advice.