Suggest Treatment For PCOS

Hi there, I was diagonised with Pcos in december last year...I am under a medication of Letrozole, Microgest and Folic Acid, from past 3 months, yet I have not conceived. i checked today morning as well assuming I had some of the pregnancy symptoms like morning sickness and food cravings...but no luck. I am really really depressed please help me out. What is wrong with me..? When will i get pregnant?