Pulling out.

So, this guy and I have been dating for a little over a month and finally did the deed. I feel really, really stupid now... but we didn't use protection and I'm not on birth control. He did pull out, and when he knew it was close he removed himself and finished himself. I know that the chances of pre cum having semen in it are low.. but still there. I also went down on him so he did already finish before... What are my chances?