i just want to know if i have hormonal imbalance cause by (overweight)...but ever since i met my boyfriend with regular sexual intercourse...my period come every month, sometimes it passed a month but i still see it... from jan 23, 2013 it came i havent seen it again...which is normal for me but not normal when my boyfriend and i have intercourse (we have been having over that period of time)....i am feeling little on an off cramps...i took two pregnancy test which show negative...could i be pregnant??? and could it be my hormonal imbalance cause the test to show negative???