My Period has always been unnormal it would come steadily for the week and then i would wait a month and it would come back. I got on birth control and was having un protected sex with my boyfriend and about 4 months later i took myself off birth control and we still have unprotected sex about every day. I havent had my period for about 4 months and my stomach has gotten bigger and i been getting headaches every day and feeling very nauseous and i took about 12 pregnancy tests and also went to the clinic to get checked out and they all came back negative i dont know what to do am i pregnant or not?

Someone please help me