Letrozole and Clomid

Mrs C

I've been on 5mg of Letrozole for a few cycles now. Went in today CD12 for mid scan and only had 1 follicle that was 13 mm. Last month was basically the same, again only 1 at 16mm. Dr said today if this cycle doesn't result in pregnancy, then we will try both meds next cycle. Any success stories? And how bad were the side effects?