Hi me and my girl friend had sex (unprotected) just before her period and I didn't ejaculate inside her, and just to be sure she took prostinor 2?

OK... Now it is a waiting game. Did she get her period on time? Scares like this indicate the need to have safe sex and use one or more methods of birth control....Consistently.
Unlikely pregnant. From what you described the likelihood of her being pregnant is almost zero.