Possibility of being pregnant?

My boyfriend and I have been together for 2 years, and recently had sex for the first time. We were extremely cautious, switched condoms every so often if it shifted, etc. After each time (this was all in one night,) he blew up the condom. None of them deflated. He ejaculated in one, but only after I told him to pull out way before he felt it coming. Fact of the matter is, I'm 6 days late, and I'm praying it's due to stress. Any ideas? Thank you.