I have been on birth control since nov. right after i had my period and after the first day of getting the shot I had sex and he accidently finished inside of me then when I was supposed to get my period on the 17 of dec. I got a very light period then it was semi-adverage period and then spotting which lasted for 11 days and I'm nervous that I could be pregant is it okay for the guy to finish every time you have sex if your on the shot?