My girl had her period 6 days late, we had unprotected sex, can she be pregnat? We had sex december 3 and her period date was suppose to be the 26th?

Possible. Anytime you have unprotected sex, there is a possibility of pregnancy. People are not as predictable as we might like and both sperm and egg have been known to be viable longer than expected. Always use condoms for std protection and an effective birth control method when you have sex, if being a parent is not something you want at this time!