Letrozole

Ha

Hi, I’m on round 1 2.5mg letrozole, I had a HSG done last month it was normal and I ovulate naturally. I’ve been TTC for 5 years it’s not MIF my partner has children. My doctor has not diagnosed me with PCOS but I know 70% of women with it isn’t diagnosed right away. Has anyone been in similar situation and Letrozole has worked ? If so how many rounds?