Can you get pregnant if your period starts the day after having sex?

Under normal circumstances, if menstruation begins the day after sexual intercourse, pregnancy is unlikely. The specific analysis is as follows:

Pregnancy generally has a higher probability when intercourse occurs during the ovulation period. Menstruation is a cyclical shedding of the uterine lining, accompanied by characteristics such as cervical mucus changes, abdominal pain, and significant emotional fluctuations. The periods immediately before and after menstruation are typically outside the ovulation window, so intercourse during these times usually does not result in pregnancy. Normally, a woman's menstrual period lasts between two to seven days, with most lasting about four to five days. During this time, after ovulation, the corpus luteum gradually atrophies and stops secreting estrogen and progesterone, causing blood vessels in the endometrium to constrict, leading to tissue necrosis and shedding, which results in bleeding. If menstruation starts the day after intercourse, it indicates that the woman’s menstrual cycle is regular. However, if there is still concern about possible pregnancy, a pregnancy test can be performed at a hospital within half a month after intercourse, under medical guidance, to confirm whether pregnancy has occurred.

It is recommended to maintain healthy lifestyle habits and use appropriate contraceptive methods. During menstruation, try to eat light foods and maintain a regular sleep schedule.