If a girl period on can she get pregnant?

No, a girl cannot get pregnant on her period.

Menstruation is the shedding of the lining of the uterus (womb). This happens when a fertilized egg does not implant in the uterus. The lining of the uterus is shed through the vagina as a period.

Pregnancy can only occur if a fertilized egg implants in the lining of the uterus. This can only happen if a sperm cell fertilizes an egg in the fallopian tube. If the egg is not fertilized, it will pass through the fallopian tube and into the uterus, where it will be shed as a period.

So, if a girl is on her period, it means that she has not ovulated and there is no egg to be fertilized. Therefore, she cannot get pregnant on her period.