I had sex about seven hours before my period started and I'm a little worried. He wore a condom and it broke. He didn't ejaculate inside me, but I'm still worried because I know if any precum managed to get inside me I could be pregnant. I am on birth control but accidently skipped a pill a week or so earlier and had to take two in one day instead of the normal one a day. What are the chances of pregnancy? When do I test for pregnancy? How many pregnancy tests should I use to be sure?