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Hello, after a woman becomes pregnant, she will not have her menstrual period again. However, in a small number of cases, women may experience vaginal bleeding after pregnancy, even on the expected date of their next menstrual period. In such situations, the pregnant woman often mistakes the bleeding for her menstrual period, leading her to be unaware that she is pregnant. This condition is referred to as "pregnancy menstruation." Its characteristics include light bleeding, pale color, and a shorter duration compared to any previous menstrual period, making it distinctly different. In reality, this is not true menstruation. This phenomenon typically occurs within the first three months of pregnancy and usually happens only once, though some pregnant women may experience it 2–3 times.The true cause of "pregnancy menstruation" is not entirely clear, but it may be a physiological response to the implantation of the fertilized egg.
Women with double uteri may have one uterus become pregnant while the other still experiences menstrual bleeding on schedule, though this is rare.
Early vaginal bleeding during pregnancy may also be a sign of miscarriage or bleeding caused by complications such as decidual polyps, cervical polyps, or erosion.
Women who have confirmed pregnancy and experience vaginal bleeding should seek medical attention promptly to rule out these conditions.