Kind of worried. Help??

So me and my bf finally broke our celibacy about two weeks ago and we used as much protection as we could think of (condom and eve said i was done w/ my fertile days) i hopped off before he "finished" but i dont think the condom was put on correctly. It doesn't feel like my period is coming soon, but im not regular. He is so positive that im not preggers but im worried i am. Is there a chance i might be?