I have pcos and with help of hormorne therapy i got my regular menses for 3months, it stopped and this time after the medication it's still not in. ?

Anovulation: You probably didn't ovulate this month. If you did ovulate this month then you ovulated late. Make sure you're staying on a low glycemic index diet and watching your weight and sweets and sugars.

Pregnancy test: First you need a blood pregnancy test if you're sexually active. If not prego and you're not trying to conceive, the goals of treatment of pcos are to give you regular periods or at least 4 periods a year, to reduce symptoms like acne or unwanted hair growth, and sometimes to treat Insulin resistance ('pre-diabetes'). If you're trying to conceive talk to your OB or see a rei specialist for help.