Judging by your explanation, it's certainly possible that you might be pregnant, but no one can really give you a definite answer except for your doctor or a pregnancy test. I am 28 weeks pregnant, and was off BC for about a month when we conceived. I took two pregnancy tests - one about 6 days before my period was due, and another when it was a few days late, and both were negative. DH and I were very disappointed, yet two weeks later I still hadn't got my period so I took another test, and the third time was the charm! I did feel nauseous around the time I took the second test, and never again after that. My boobs started to feel really heavy around the time I found out, which was about 6 weeks.
I wish you the best of luck and hope that you get your wish! Just remember everyone is different, so the best way to find out for sure is to take a test or see your doctor. And if it turns out you're not pregnant, it's always fun to try again!