I took the depo shot in nov 2010 I had my period for weeks,I miss my period for two months and I miss my next depo shot in feb I have been having a lot of unprotected sex my period came but it haven't been regular I took a pregnancy test two before my period but it was negative... I have a lot of headache I eat a lot I have gain weight, I sleep a lot and I have mood swings... is it possible am pregnant but my hgc level to low to pick up?