Ovulating on Letrozole but no pregnancy

I’ve successfully ovulated (verified with bloodwork) on 2.5 mg letrozole and 50mg clomid but neither have resulted in pregnancy. My question is, can the dose impact outcome? Like, even though I’m ovulating on the lowest dose, is it possible I need a higher dose to produce larger/better follicles? Both medicated cycles were unmonitored with my obgyn. She will not up my dose since I’m ovulating. I’m doing one more round unmonitored starting in 2 days and I have my first RE consult in 2 weeks.