First IUI, any advice?

Hi! We're doing our first <a href="https://glowing.com/glow-fertility-program">IUI</a> this month, am on CD1. Since we have no experience and had nobody to talk to who has been through this, we're a bit skeptical in terms of course of treatment before the <a href="https://glowing.com/glow-fertility-program">IUI</a>. My husband has low morphology and I have PCOS, however, I ovulate every month successfully. The first doc we've been to said I should start with letrozole for 5 days, have an ultrasound to check and then 5 days of injections with hormones (not sure what). The amount of letrozole she recommended was 20 mg per day. I am no doctor, it seems however to be a large dose for someone who a actually ovulates, so I wonder, has any of you been prescribed such a dose?