4months back i hav consulted doctor for periods problem. she given tablet to get periods . she said to have tablets 3 days (1-1-1). after 20days i got periods.. and she gave thyriod tablets thyronrm 25mg to have daily. and she said after tht period u can try for pregnancy any time. today its 3 months i didnt got periods.. but i dont have any symptoms.. my period times are 3rd of every month.please suggest me what to do.