If i had unprotected sex during my period can i be pregnant ?

See below: If you have sex at the very end of your menstural cycle and you still have viable sperm in your body by the time you ovulate - it is possible. However, would require all the timings of things to come in line.

Unlikely: Unlikely , but need to cheek for std see your doctor.

Possible: While it is less likely to have an egg get fertilized and stay in the uterus and successfully grow during menstruation... It is not impossible. You wouldn't be the first person.