Egg Collection and Embryo Transfer: What Happens, Sedation, and Recovery

Egg collection and embryo transfer are the two hands-on procedures at the heart of an IVF cycle: eggs are gathered from your ovaries under sedation, fertilised in the lab, and a resulting embryo is then placed back into your womb a few days later. They sit in the middle of the cycle described in IVF explained, after roughly two weeks of stimulation injections. Knowing exactly what each one involves takes a lot of the fear out of the day, which is why this guide walks through both step by step.

Egg collection: what happens

Egg collection (also called egg retrieval or oocyte retrieval) is a short day-case procedure in which mature eggs are drawn from the ovaries using a fine needle guided by ultrasound. It usually takes about 20 to 30 minutes, and you go home the same day.

You are given sedation or a light general anaesthetic, so you should not feel the procedure itself. A thin needle is passed through the wall of the vagina into each ovary under ultrasound guidance, and the fluid from each follicle is gently drawn off so the embryologist can find the eggs in it. The number collected varies a lot between people; it depends on how your ovaries responded to stimulation, not on a fixed target.

It is timed precisely: the eggs are collected around 36 hours after a final “trigger” injection that ripens them, so the appointment cannot move once that injection is given. When I went through it, the strict timing was the part I had not expected, and I found it helped to plan the day around it in advance.

Sedation and how long it takes

You are not usually fully asleep for egg collection; most UK clinics use conscious sedation plus pain relief, while some offer a general anaesthetic. Either way you should be comfortable and will remember little of it.

Because sedation wears off slowly, plan to be at the clinic for a few hours even though the procedure is only about 20 to 30 minutes. You must not drive afterwards, so arrange for someone to collect you and ideally stay with you for the rest of the day. The NHS advises that you should not sign important documents or operate machinery for 24 hours after sedation.

Recovery after egg collection

Most people recover quickly and feel back to normal within a day or two. Some cramping like period pain, bloating, and light vaginal bleeding are common in the first day or so, and simple pain relief such as paracetamol usually helps.

Rest on the day itself and ease back into gentle activity over the next day or two. The one thing not to dismiss is the small risk of ovarian hyperstimulation syndrome (OHSS), where the ovaries overreact to the medication. Contact your clinic urgently if you develop severe or worsening tummy pain, a tense swollen abdomen, breathlessness, vomiting, or much reduced urination, as these can be warning signs that need prompt review.

Embryo transfer: what happens

Embryo transfer is the procedure that places a developed embryo into your womb, and it is far gentler than egg collection: it takes only a few minutes and needs no sedation.

It happens after fertilisation in the lab, typically two to five days after egg collection, once the embryologist has watched the embryos develop and selected the most suitable one. A thin, soft catheter is passed through the cervix and the embryo is released into the womb, usually with ultrasound guidance and often with a comfortably full bladder to improve the view. Most people compare it to a cervical screening (smear) test. Clinics generally transfer a single embryo to avoid the risks of a multiple pregnancy, and any other good-quality embryos can often be frozen for a frozen embryo transfer later.

What to expect afterwards

You can get up and go home very soon after embryo transfer, and you do not need to lie flat or take to your bed. There is no good evidence that strict bed rest improves your chance of success, so most clinics encourage you to return to gentle normal activity.

You may have a little spotting or feel some cramping, which is normal. Take any prescribed medication, such as progesterone to support the womb lining, exactly as directed, and avoid smoking, alcohol, and very strenuous exercise. Then comes the two-week wait before your pregnancy test, which many people find the hardest stretch of all; planning how you will get through it is genuinely worthwhile.

This guide is general information and support, not a diagnosis or treatment plan, and it does not replace individual medical advice. If you have concerns at any stage, do not wait: speak to your GP or fertility specialist.