The term “menstrual period” is generally used to refer to a woman’s period. You can’t get pregnant if you have your period, but if your period is too light, you can’t rule out the possibility of pregnancy.
If you have sex before menstruation, the ovarian corpus luteum will secrete progesterone if conception occurs, so that the lining of the uterus will not shrink and fall off, which is favorable for the egg to settle and develop. If conception does not occur, the corpus luteum atrophies and the endometrium sheds, producing menstruation. So, if the menstrual flow is normal, you are usually not pregnant.
However, if the menstrual flow is significantly less than usual, pregnancy cannot be ruled out. This is because when the pregnant egg is implanted, due to the fluctuation of hormone levels in the body, the endometrium will shed a small amount, resulting in a small amount of vaginal bleeding.
Therefore, if there is a significant decrease in the amount of menstruation, you also need to be vigilant and rule out the possibility of pregnancy. Consultation with a medical professional is recommended for specific cases.