My girlfriend and I kinda had sex yesterday (in the sense that I barely put it inside her and did not break her hymen), but I did not finish inside of her. There may have been a bit of pre-** inside her, but moments prior to this, she had begun her menstrual cycle and was bleeding (we didn't notice because the lights were off). Considering that her cycle is about 40 days long, so there isn't a great chance that she begins to ovulate during her period, and we did it at the very beginning of her period, I was wondering what the odds would be of her getting pregnant.