CD1 🤞🏼🤞🏼

Today is CD 1 for me!! Doing my first IUI this cycle. I have pcos. My husband has no issues. We have been trying for a year with no success. Hsg was clear and shg was clear. All my blood work is clear. I have no periods so I take provera to have a period. Praying that IUI is what we need!! I am going in for an ultrasound next Wednesday which will be my CD10? Is that not early for looking for mature follicles? I am also taking letrozole 5mg and doing trigger shot. Just worried CD10 will be to early. Has anyone else had mature follicles enough to trigger and been successful?