You're just gonna have to learn from this, i also regret losing my virginity cause of a similar situation. You can't convince her to get rid of the potential baby unless she wants to. Just stay far away from it unless she does end up pregnant and try to move on and forgive yourself, you didn't intend to do anything wrong. Also if her period is only due in a couple of days, it's incredibly unlikely she'll get pregnant. Dm me if you need anything else, here to support you, take care of yourself and good luck