What Causes Irregular Periods And Weight Gain?

Good morning doctor my name is swathi i am 30 year old,i am suffering from irregular period,i got married in2012 Since last year my cycle is not correct and i put on weight i used many medicines but no use i did not conceived, now i am not taking any medicine ,plz doctor can u help me out how to reduce the weight and concive.My husband is facing obisity problem his age 33 he is taking BP tablets