It’s highly unlikely to experience your first period while you’re pregnant. Pregnancy involves the implantation and development of a fertilized egg in the uterus, which requires a nurturing environment with a well-functioning uterine lining. Menstruation, which involves shedding of the uterine lining, generally doesn’t occur during pregnancy. If you suspect you might be pregnant and are experiencing bleeding, it’s important to consult a healthcare professional for proper evaluation and guidance.