I have a problem irregular mensis.. I am 24 years old. Having no kids.I consult to gynecologist she prescribed me prologuton for three months course. I am taking from last month... Now my 2nd month course start. Just after periods.now my periods regular .. I am.also underweight. My question.. Is that it can be possible weight gain through it..??and is dat it's affect on fertility?? I feel my belly is increasing is this prologuton causes??