Help please !

So 2 saturdays ago me and my girlfriend had sex. The first few strokes we were raw, maybe 4 or 5 strokes, not enough to produce pre cum, or atleast I believe not. We then used a condom. I then took the condom off and did a few more strokes ( I did not ejaculate ). 2 days later, my girlfriend got her period. She has irregular, short, frequent periods. It lasted until Thursday morning. Thursday afternoon until Sunday she was talking about she was having these weird lower abdomen cramps she hasn’t experienced before, from her belly button down. I’m scared it could be a possible pregnancy but everybody is telling me im fine. I’ve also read pregnancy symptoms wouldn’t happen that soon. I’m going to test her Saturday morning which will roughly be 13 days and a few hours. I need advice