IUI question

So my husband and I have been TTC for almost a year now and have seen a Fertility specialist. My husband has low sperm count and low motility. The only issue I have is that I ovulate a little later than MD would like on CD 18 or 19 instead of CD 14 or 15. I took femara last month and am pretty sure I am out this month. AF is supposed to start in 2 days and got a negative test today and BBT isn't rising. I talked to the Fertility specialist today who is amazing by the way and he said if we wanted to be more aggressive then he would suggest for next month femara again then ultrasound around CD 11 followed by trigger medication then an <a href="https://glowing.com/glow-fertility-program">IUI</a>. I am fine with all this but don't really know what to expect. What do I expect with the <a href="https://glowing.com/glow-fertility-program">IUI</a>? Has anyone had success with <a href="https://glowing.com/glow-fertility-program">IUI</a> with husband having sperm issues? I see people posting about the follicles they have. This may be a dumb question but how do you know how many follicles you have and health status of them? I'm assuming the ultrasound? Any advice or insight would be greatly appreciated. I'm starting to get a little down and lose hope considering everyone around me is either pregnant or just had a beautiful baby. Baby dust to all! 👶