hello I'm 25 180 pound and no medical history my question is this is my fifth month with out my period and Ive taken three hpt and they all came back negative, i weighted 155 few months ago and now up too 180 I even look pregnant I'm a mother of three and knew right away i was pregnant and test came back positive with my three kids and I'm not having any symptoms of pregnancy but i was wanting to know what could cause me to go five month with out a period