Me and my girlfriend had sex and when I *** I took the condom off and it accendenty rubbed her and went in about .5 of an inch and she had her period the next day could she be pregnant

Odds would be very, very low for her to become pregnant in that situation. She can see what happens when you would expect her next period. Of course, in the future, be extra careful when removing the condom.

The two of you may want to consider an additional form of birth control as well to lessen the chances even more. She can discuss options with her doctor if interested.