My cycle is usually a very regular 28-29 days. My last period started June 6, 2012, so I was expecting my period on July 3-4, only it didn't come. My boyfriend was home from boot leave for the month of June and we had unprotected sex numerous times, though we always put a condom on before he finished, so it's entirely likely I'm pregnant. My breasts are sore, I'm gassy beyond belief, and constipated. I have been experiencing headaches for the past couple weeks, and lower backaches. I have extremely mild cramps every now and then, which is not typical of my period. Usually I have massive, debilitating cramps for the few first and few last days of my cycle. I think maybe I saw a little blood last night when I was in the tub, but I cannot be sure because it was only a little bit and it stopped. Yesterday I was nauseuos most of the day and I am slightly nauseous now. I've been noticing certain food aversions and I've been craving peanut butter. I haven't made any lifestyle changes recently and I've not been on birth control since December 2010. I had a miscarriage March 2011 at 6 weeks. Can somebody please explain to me what's going on?