Pregnant or what ?? please help?

I am on the pill and had on 3rd June and we used a condom as well and then again i had last saturday this time without a condom... I have bn having alot of upper tummy pain and am also feeling sick.. Don't know if its a tummy bug or what. I take my pill at the same time everyday and haven't missed one. I have taken a test and its negative.. what do you think??