so my girlfriend and i were having sex and it felt weird according to her so we checked and the condom had come loose, not fully off but the only part still on was the tip area, it was noticed pretty much straight away and withdrawn quickly, i did not ejaculate, i know there was pre, there always is, but im still worried, she has a 3-4 cycle and it was the day just after her period ended, please help i am quite worried about this