I posted elsewhere but im just a bit overly paranoid. I know theres a possibility of becoming pregnant through precum. I dont know if there was precum involved but me and my boyfriend were fooling around and he came in contact yet he reassures me that there was no precum but I am not so sure as I felt some like 5 minutes prior and was not expecting to go as far as I did although he did not go in. Also I was on about the 3rd day of my period wen it happened.Now it is one week from the day we fooled around,my period is over and all but I have the worse stomach pains that dont go away for about a week now.

Could it be possibile to become pregnant,what are the chances?And what could the stomach aches be caused by?