Is it true that there is no way to get pregnant during menstruation?

-- Pisto

Yes and no. If it is truly a menstrual period, then pregnancy will not occur. But not all bleeding is menstrual. In fact, many women will have midcycle bleeding around the time of ovulation. Bleeding can also occur due to polyps or cervical problems that can make you believe you are on a period, when the bleeding is actually due to another cause. You may think you are safe, but you are actually at a fertile time.

Bleeding that occurs 14 days after a rise in basal body temperature and immediately following the fall in temperature is likely menstrual and is a safe time for intercourse if you do not want to get pregnant.