No, a pregnant woman cannot have a period. A period occurs when the lining of the uterus sheds if a fertilized egg doesn't implant. During pregnancy, the lining of the uterus is thickening to support the growing fetus, and a period cannot happen.
While it's impossible to have a period during pregnancy, some women may experience vaginal bleeding or spotting. This can be caused by various factors, such as implantation bleeding, hormonal changes, or even a problem with the pregnancy. If you experience bleeding during pregnancy, it's important to contact your doctor.