Could I Still or are pregnant???

I stopped taking my birthcontrol pills about 1 week before a had unprotected with my bf about 1 month ago 3 days before i started to ovulate. My period came out late, and im guessing because i stopped taking my pills which might of made my body to to through some changes. during this time, my hurted alot, and in the morning i felt like i had to throw up, but never did. I play kickboxing and i get hit in the stomach alot. A week and a half after we had , i took a pregnancy test, and it came negative. My period was about 1 or 2 weeks late. And it was pretty heave. Now today, its been about 1 or 2 weeks after my period, and i took another test, and it came negative. Could i still be pregnant???? Can anyone plz help?