Hi. Me And My Girlfriend Got Really Excited But We

Hi. Me and my girlfriend got really excited but we didn't want really wanted to have sex. What she did was, just with our underwears on she rode on me. I fingered her. I didn't ejaculate but had few drops. I don't know if it's semen of pre ejaculate. We both are virgins my the way. We never had sex. She went home and found some blood in her undies. We both are scared now. She calculated and the day she was supposed to ovulate was on the 5th of this month. She has pcos so she keeps a track on those days