Cramps after sex?

My Girlfriend and i had sex right at the train of her period. this be the first time we had sex ever. we be virgins. she's 15 and small. she says she's be having ambience like a discouraging cramp for a week now. she touched the presemen but it she say it dried before she touched the condom on my penis to guide me surrounded by. i did not ejaculate inside her. i ejaculated surrounded by the condom outside of her. could she be pregnant? what is this cramping after the sex? i'm worried. Don't worry, she's probably not pregnant. The cramps are within b/c she's young and does not all the same have a regular cycle, conceivably it's remorse, or she says so simply b/c she does not want to enjoy sex with you again!
I don't give attention to she's pregnant.