IUI. What caused you to get to that point?

Kylie • Pregnant with a baby girl after 8 years TTC. 💕
Hi ladies! My husband and I have been trying to conceive for 4.5 years after a miscarriage. 
Come to find out, all is well with me but, he has a very low sperm count. With us trying for so long with no luck, we've jumped right into <a href="https://glowing.com/glow-fertility-program">IUI</a>. 
He's been on clomid every other day for a month now. 
Today is cycle day 1 for me. I begin clomid day 3-7. Have an HSG & ultrasound scheduled. Have an ovidrel (sp) trigger shot that I'll take when needed. Then the actual insemination of course. 
I'm soooo anxious & excited! 
My question is what caused you to get to the point of <a href="https://glowing.com/glow-fertility-program">IUI</a>? 
Was it PCOS
Blocked tubes? 
Your man's sperm count? 
Unexplained? 
UPDATE:
I just wanted to thank you ladies for your input! I know this infertility struggle is more common than not. As bad as it sucks to say, I'm glad there's a big group of us that can support each other and be there to understand one another. 
I wish all of you the best of luck! I'll be thinking about all of you. 💕