Understanding Menstrual Changes After Egg Retrieval

Egg retrieval is a crucial step in the IVF and Frozen Embryo Transfer (FET) processes, and it is common for it to lead to several changes in your menstrual cycle in the weeks that follow.

Egg retrieval involves collecting mature eggs from a woman's ovaries to be fertilised with sperm in a laboratory. After a process of ovarian stimulation using hormonal injections, the egg retrieval occurs via a minor surgical procedure. The hormonal changes involved can lead to unexpected menstrual changes in the days and weeks that follow. According to the HFEA, IVF is one of the most common fertility treatments in the UK, with tens of thousands of cycles carried out each year.

These changes can include delays in the onset of the first and second period, changes to flow, and irregular cycles as your body adjusts after treatment. Understanding what is normal can help you navigate this part of your IVF journey with more confidence.

Menstrual changes after egg retrieval

Delayed menstruation

It is common for the next menstrual period to be delayed after egg retrieval. The hormones used to stimulate the ovaries can disrupt the normal menstrual cycle, causing a delay of several days or more. Once this first period occurs, it may also take some time for the body's natural hormonal cycle to reestablish itself, which can result in a second period that is also delayed or irregular.

Changes to menstrual flow

The first and second period after egg retrieval can be heavier or lighter than usual. This variability is due to hormonal fluctuations and the effects of the medications used during ovarian stimulation. You can read more about what ovarian stimulation involves here.

Heavy bleeding may also be accompanied by more intense cramps. This is related to the thickened uterine lining that builds up during hormonal stimulation and is generally considered normal.

Menstrual cramps

Some women experience more intense menstrual cramps during their first period after egg retrieval. The ovaries can remain enlarged and sensitive following the procedure, which contributes to increased discomfort. This usually settles as the body recovers over the following weeks.

Cycle irregularity

Many women find that their menstrual cycles do not return to their usual regularity immediately after egg retrieval. The body needs time to normalise its hormonal balance after IVF treatment, which can cause temporary disruptions in cycle length and flow. It is not uncommon for the second period to also be delayed as the body continues to adjust.

These changes are generally temporary. However, if you have any concerns or if menstrual irregularities persist beyond two or three cycles, it is important to speak with your healthcare provider.

Types of period after egg retrieval

After egg retrieval, the type of period you experience will depend on whether an embryo transfer took place and whether it was successful. Here is what to expect at each stage.

First period after egg retrieval

If no embryo is transferred, or if an embryo transfer does not lead to pregnancy, the first period usually occurs around 10 to 14 days after egg retrieval. This period marks the shedding of the uterine lining that was built up in anticipation of a possible pregnancy. It may be heavier than usual and accompanied by stronger cramping.

Delayed or irregular first period

Sometimes the first period after retrieval can be delayed or more irregular than usual due to the hormones administered during the IVF cycle. This can also affect the flow and symptoms associated with the period. A delay of a week or two beyond what you would normally expect is not unusual.

Second period after egg retrieval

If the first IVF attempt is not successful and no further treatment is initiated immediately, the second period will typically follow the natural cycle of the woman, though it may still be influenced by the previous hormone treatments. This period is often more regular than the first post-retrieval period as the body begins to normalise.

Absent periods

Absence of periods after egg retrieval may occur if you become pregnant following the embryo transfer. Alternatively, if periods do not resume a normal pattern after treatment, this may indicate the need for further medical evaluation and should be discussed with your fertility specialist.

Prolonged or continuous bleeding

Some women experience prolonged bleeding or spotting due to the hormonal changes involved in egg retrieval and embryo transfer. Light spotting in the days immediately following retrieval is common, but heavy or prolonged bleeding should always be discussed with your clinic.

Supporting your body after egg retrieval

The period following egg retrieval is an important time to support your body nutritionally, whether you are preparing for a frozen embryo transfer or waiting to start a new cycle. Key nutrients including CoQ10, omega-3, vitamin D and antioxidants all play a role in supporting cellular recovery and hormonal balance during this time. Read our guide to CoQ10 dosage for fertility here.

If your partner is also preparing for a subsequent cycle, male nutritional support is equally important. Sperm quality can be meaningfully influenced by diet and supplementation in the months leading up to IVF. The Zita West male fertility supplement range is formulated to support sperm health ahead of treatment.

Preparing for a frozen embryo transfer

If you are preparing for a frozen embryo transfer following egg retrieval, nutritional support in the weeks beforehand can make a meaningful difference to uterine lining health and embryo implantation conditions. Fertility expert Zita West and Aria Fertility Clinic Director and Embryologist Robert Smith hosted a free webinar covering how to enhance your IVF success both holistically and scientifically, which is worth watching if you are at this stage.

Zita West also offers an ultimate set of visualisations covering pre-transfer, transfer, post-transfer and the two-week wait, to support you through each stage of the process. If you would like more guidance on what to expect during the two-week wait specifically, our day-by-day guide to the two-week wait covers what is normal and what to look out for.

FAQs: menstrual changes after egg retrieval

What can I expect for my second period after egg retrieval?

Your second period after egg retrieval may still be slightly delayed or different in flow compared to your usual cycle, as the body continues to adjust hormonally. Most women find the second period is more regular than the first, and cycles typically normalise within two to three months of the procedure.

Is it normal to miss my second period after egg retrieval?

Missing or having a delayed second period after egg retrieval is not uncommon. The significant hormonal interventions involved in IVF can take time to fully clear from the body. If you have concerns or if periods do not resume within a few months, speak with your fertility specialist.

Why is my second period after IVF late?

A delayed second period after IVF is usually the result of the hormonal treatments used during the cycle continuing to influence your body's natural rhythms. This is temporary for most women. If your period is significantly late and pregnancy has been ruled out, it is worth discussing with your clinic.

Can egg retrieval affect my menstrual cycle long-term?

For most women, the menstrual disruption following egg retrieval is temporary and cycles return to normal within two to three months. Long-term cycle disruption following a single egg retrieval is not common, but if your cycles remain irregular beyond this point a conversation with your healthcare provider is advisable.

Is it normal to get my period just 5 days after egg retrieval?

Getting your period or experiencing bleeding very shortly after egg retrieval can occur, though it is not typical. This is more likely to be light spotting or breakthrough bleeding related to the procedure rather than a true period. If you have any concerns about the timing or nature of bleeding, always consult your doctor or clinic directly.

What supplements should I take after egg retrieval?

After egg retrieval, supporting your body with targeted nutrition can help prepare for a frozen embryo transfer or a new IVF cycle. Key supplements include CoQ10 for mitochondrial and cellular support, omega-3 for inflammation and uterine health, and vitamin D for hormonal balance. The Zita West IVF supplement range covers each stage of the process, and our nutrition team is available for a free 1:1 consultation if you would like personalised guidance.

External references: NHS: IVF, what happens  |  HFEA: In vitro fertilisation (IVF)

This content is for educational purposes only and is not intended to diagnose, treat, or replace medical advice. Always consult your fertility specialist or healthcare provider if you have concerns about your cycle following egg retrieval.