IUI? Low sperm count??? Pcos !!?

I was diagnosed with PCOS July 2016 I took 2 cycles of metformin alone 3 on clomid and will be starting my second Letrozole next week.... my husband had a semen analysis done 2/20 and doctor called me today that he has a low count of 5 million... now he has an appointment in april and depending on what they say we might need to do artificial insemination (<a href="https://glowing.com/glow-fertility-program">IUI</a>) 
Has any one had any success with <a href="https://glowing.com/glow-fertility-program">IUI</a> what cycle did u get pregnant on? Any feed back at all... in truly heart broken because we have been trying for 5 years now almost a year with doctor help...