Can you have period of you are pregnant day before?

No, you cannot have a true menstrual period if you are pregnant. When a woman becomes pregnant, her body begins to produce hormones that prevent the shedding of the uterine lining, which is what occurs during a menstrual period. However, some women may experience light spotting or bleeding in early pregnancy, which can be mistaken for a period. This bleeding is typically not the same as a menstrual period.