Reg. Period And Pregnant?

I think you would get a better response if you posted this topic in the pregnancy forum.

From about.Com

what normally happens to cause a period?

In a non-pregnant woman, there is a monthly cycle of female hormones which controls the release of an egg and causes the lining of the womb to thicken. If that egg is not fertilized, hormone levels fall at the end of the month, and the womb lining breaks down and is shed as a period.

What happens when a woman is pregnant?

When a woman becomes pregnant, the cycle of hormones is usually lost. Instead, hormones' levels increase to stimulate the womb and make it ready to support the developing foetus. So no womb lining is shed - and there are no periods during the pregnancy.

What could explain these rare cases of periods during pregnancy?

There are two possible explanations:

hormone levels aren't high enough. In some women, the hormone levels in pregnancy aren't high enough to prevent the lining of the womb being lost in those areas where the placenta isn't attached. So sometimes a woman will have one episode of bleeding or more in the first month or two of pregnancy (and, rarely, throughout the pregnancy).
The bleeding is due to something other than a period. For example, a pregnancy-related cause of bleeding, such as a tubal pregnancy, or another cause, such as polyps on the cervix. In these cases the bleeding isn't usually regular like a period.