I am not on birth control and my boyfriend was fingering me about a week ago. He adjusted himself/touched his penis quickly at some point. It is possible there could have been pre-cm on his penis (I'm not sure). He never ejaculated at any point. I know at the time that I was a few days past the end of my period, coming up on my time of ovulation. I still have over two weeks until any kind of missed period. What are the chances that this could have caused pregnancy?