Letrozole

I've been TTC for 6 months now (I'm 33 yrs old) and didn't have a period for the first 5 months after stopping BC. I ovulated for the first time last month, got a light period and then my doctor confirmed today that I haven't ovulated again. She prescribed by Letrozole that I will start tonight. Has anyone had experience with this drug? Curious about size effects and success(or not). Thanks!