I just don't know?

Tiffany
May 18 I had my period, I started my birth control again, but was super nauseous everyday I took it. I decided to stop taking it and the nauseous feeling subsided a little, but then I caused my period again on June 11 (I'm assuming). 
Ever since then my boobs have hurt everyday, I've had a headache almost everyday, my back hurts, Always hungry, and nauseous if I don't eat and I'm always tired. 
I took a couple tests early on when the nausea was so bad and they were negative. 
I had really bad cramps when my July period was suppose to start but I never had one. I missed it. I am now bloated a little with a hardness to my stomach. 
Could I be? Could I have taken the test to early? Could the bc have messed with the test giving my a false negative?