Bleeding in early pregnancy after IVF: why it happens and when to call

Several features of IVF pregnancies make light bleeding more likely than in spontaneous pregnancies. A subchorionic haematoma, a small collection of blood between the membranes and the uterine wall, is reported in around 15–20 per cent of pregnancies after embryo transfer. Vaginal progesterone, used for luteal support, makes the cervix more sensitive and more richly supplied with blood, so an examination or intercourse can cause spotting. Implantation itself, in the days after transfer, can bring light brown or pink spotting.

There is also a statistical reason: after IVF women are scanned very early and report every spot, whereas in a spontaneous pregnancy many light episodes go unnoticed or unrecorded. That does not make bleeding unimportant, but it puts it in context.

The answer to “is the pregnancy continuing?” does not come from the amount of blood but from the scan. At 6–7 weeks the gestational sac, yolk sac and the embryo’s heartbeat are visible. When the heartbeat is present and growth is regular, the chances that the pregnancy will continue are high even with a small haematoma. When the scan is too early to show these signs, measuring β-hCG on two separate days helps with interpretation.

Studies in IVF patients show that a subchorionic haematoma is linked to a somewhat higher risk of early loss (in one large cohort about 10 per cent versus about 6 per cent without a haematoma), yet even in that group more than 85 per cent of pregnancies ended in a live birth. This is why the doctor is not alarmed by every spot, but follows the pregnancy more closely.

Continue progesterone and all other medication exactly as prescribed; stopping them on your own is the most frequent and most harmful mistake. Note the amount and colour: brown or pink spotting that does not fill a pad is generally light; bright red blood that needs a pad change every hour is a different sign. Avoid intercourse and heavy physical effort until you have spoken to the team, not because they would change the outcome, but to avoid confusion about the cause.

Strict bed rest does not change the course of a haematoma and is not recommended as treatment; quiet everyday activity is allowed unless your doctor says otherwise. If you have an appointment within two or three days and the bleeding is light and painless, you can usually wait until then, but a short call to let the team know is always welcome.

In a small proportion of cases bleeding signals a pregnancy that is not developing, a pregnancy outside the uterus or, very rarely, another problem. Ectopic pregnancy is more frequent after IVF than in the general population even though the embryo is placed in the uterus, so any bleeding with one-sided pain, shoulder-tip pain or dizziness is assessed urgently. These are the exceptions, but they are the reason the team wants to hear about every episode of bleeding, not only the ones that seem heavy to you.

If the scan shows a pregnancy that is not continuing, this is a real loss and deserves time, explanation and a calm plan for the next step; in most cases it has nothing to do with anything you did or did not do.