I've been taking birth control for over a year now, and 5 weeks ago I had an episode of passing out for not eating. a week later, I got my period on the date I was supposed to, but it was a really light period, it lasted for only 3 days,  Then somehow I started with this weird thing of being pregnant, so I did a pregnancy test, not only once, but four times, in different weeks and they all came negative. I kept on taking my pill regularly, got my period this month as planned, and for some reason I still think I'm pregnant. Is it possible or is it just something from my mind??? My bf and my friend said that I need to stop with this, but I can't until I know for sure. please help me..