Verified answer

It doesn't come at all if you are pregnant,well a few women will carry on having periods in pregnancy but that isn't what is 'expected',also a lot of women will have some light bleeding early on which is implantation or just bleeding that is often unexplained but not a real period.

It doesn't delay then come back later in the pregnancy,for most women periods stop for the entire pregnancy,then there is post birth bleeding followed by the return of regular periods which can vary between women in how long it takes for cycles to become regular again.

A womens monthly period is her body's way of getting rid of an UN-fertilized egg. The uterus spends each month building an environment to sustain a pregnancy. Each month that goes by without getting pregnant, the uterus sheds its lining and discards the egg and basically starts the cycle over, so on and so forth. Therefore, when a woman becomes pregnant, her body stops shedding the lining each month and dedicates the next 40 weeks to developing the baby. Women can have bleeding while pregnant, and it can get confused with being a period. However, it is not. Bleeding during pregnancy is common, can be due to many factors such as sex, infection, miscarriage, pelvic exams, placental issues etc...But the monthly shedding of the uterus halts altogether while a woman is pregnant.

There are lots of reasons that menstruation might be delayed. Pregnancy is one, but it can be delayed by stress or even illness.

Anorexics rarely get periods, they aren't healthy enough and their low body weight can't support this function.

If you aren't pregnant and you haven't yet got your period then this would be referred to as a 'delayed period'.