Why did I get my period twice in one month?

It is usually one of two things: a short cycle that put two real periods inside one calendar month, or bleeding between periods that is not a period at all. They can feel the same, so it helps to tell them apart.

A short cycle. The NHS describes the average gap between the first days of two periods as around 28 days, with anywhere from 21 to 35 days common, and calls a cycle irregular if it is shorter than 21 days or longer than 35. A cycle of 21 to 28 days can easily give you a period on the 2nd and another on the 30th, and a calendar month is 28 to 31 days long, so two starts in one month is sometimes just arithmetic. Count from the first day of one period to the first day of the next, not by the month.

Bleeding between periods. If the second bleed is lighter, shorter, or arrives well before the next one was due, it may not be a period. The NHS lists hormonal contraception (including the pill), small growths in or around the womb such as polyps or fibroids, and infections such as chlamydia as common causes of bleeding between periods. It also lists stress, big changes in weight, a lot of exercise, thyroid problems, polycystic ovary syndrome (PCOS) and the early stage of menopause among the causes of cycles that run irregular. A period usually lasts between 2 and 7 days, most often about 5, which is another way to tell a short bleed from a full one. You can read more in why periods become irregular and what counts as a normal cycle length.

When to raise it with a doctor. The NHS says to see a GP if you are bleeding between periods or after sex, if your periods last longer than 7 days, or if your cycles are irregular. Always get unusual bleeding checked, because the NHS notes it can sometimes be a sign of something that needs treating. If you have recently missed a period, have unusual bleeding and have pain in your tummy, the NHS says to get urgent medical help. This page cannot tell you which of these applies to you, and a clinician can.

What it means for your worship. The medical question and the fiqh question are separate. Whether a second bleed counts as hayd or as istihadah depends on its timing and its characteristics, and brown or yellow discharge has its own discussion in sufrah and kudrah. It is worth knowing that istihadah does not stop prayer or fasting, so do not stop praying until you have worked out which one you are seeing. A short bleed after what looked like the end of your period is also covered in how to know your period has ended.

A written record makes the pattern visible: the first day of each bleed, how heavy it was, and how long it lasted. That is exactly what a doctor will ask, and it is what you need to place each day correctly. What to look for in a period tracker built for Muslim women lists what to check, and Nisaa, free on the [App Store](https://apps.apple.com/app/id6756938661), keeps this log and marks each day by the school you follow.