Whats going on!!

So I got my period two weeks early and I keep on getting pains in my stomach and i did have unprotected sex, I decided to take a home pregnacy test and the results where negative, but im still having some pains in my stomach and im worried that maybe i took the pregnacy test to early, I dont really want to take another test yet but it was kinda like i was spotting abit after my period at first, but i havent scinse, so i dunno if since i took birth control it messed my hormones all up ( ive stopped taking birthcontrol before and it never did this) or because of something else, im not to sure whats going on, my bf thinks it could be from all the stress the past few weeks, but im not so sure… Im 17 years old and am pretty confused, I know they say dont stress and try not to think about it cause you can trick your self into being pregnant sympyoms, so i have been kinda ignoring it but I can’t just ignore the painds so yah,,, :unsure: :unsure: :S