I started my period July 9, last day was July 14th. My boyfriend and I had sex July 20th we did use a condom. The first time we had sex he did not ejaculate. The second round we changed condoms we used a new condom just to be on the safe side. The condom busted at the tip the 2nd round we had sex. He says he didn't not ejaculate the first time nor the second time, but I did have a lot of his precum coming out of me. I took plan b the next morning about 13 hours later. Is there a chance I can be pregnant?