Could you be pregnant if are on your period for eleven days?

No. If a person has a typical menstrual cycle, it is not possible to be pregnant while on their period, no matter how long the period lasts. Menstruation is the process by which the lining of the uterus is shed. This lining is what would nourish a fertilized egg if pregnancy were to occur. Without the uterine lining, a pregnancy cannot implant and develop. Eleven days is not a typical length for a menstrual cycle. If an individual has a period that lasts longer than seven days, they should consult with a healthcare professional.