Hi, welcome to HCM,
Like any drug letrozole
has side effects commonly hot flushes diarrhea
, nausea, head ache, vomiting, muscle ache etc..
It has a fetal risk also..It may cause congenital defects in the child.
So if u are taking drug regularly then postpone your pregnancy
till that time.. As for PCOD, if u exercise daily and reduce your weight that it self will help you get back your periods regularly.. And later when you are planning for a family you can go for ovulation induction