I am 20 years old. I've been having unprotected sex with my fiancée for over three months now. We are trying to conceive. He's away now and won't be back for 20 months. I started my period on the 22nd of February and it was off by the 24th. It started really heavy and then it got under control the next day. On day three it was pretty much gone. Just a spot or two. I'm not sure if this could be a sign of pregnancy or not. I took a test and it came out negative. I have absolutely no idea what's going on. This has NEVER happened before. Do I need to go and see a doctor or should I wait to see what's going to happen with my next period in a month or so. I've noticed that I hardly eat anymore(at least nothing really healthy)and I've been light headed with really bad mood swings/emotional stability. Is this a sign of pregnancy?