For a start I'm on the pill but I missed a days tablet. For just under three months I had a period every other week . I had sex three and a half months ago and because it was my virginity I started bleeding , I was on my period for about a week then had a week off and then I was bleeding for another five days. I haven't had a period since and my stomach feels harder to me I can still breather in and push my belly in , is it me imagining it because I'm panicking or could I be pregnant? Also I've took two pregnancy tests and the both turned out negative . Please help me