Have you done with your HSG test before?
Did you take Clomid? If yes, how was the response during the IUI?

Tried naturally for 1.5 years but nothing happened. Went to a fertility centre (super ex in DC Mall) and upon checking I have PCOS and 2 large cysts (1 even took over my left ovary) did the surgery in end 2017 and let it heal. Hubs had low motility sperm which can be rectified with supplements and quitting smoking/vaping.

Surgeon said nothing wrong so we continued trying naturally but still after half a year nothing happened. In 2018, though didn't think much as we were trying to get healthier and lose weight so that we're both fitter when the kid comes.

Fast forward to 2019, his cousin recommended another fertility specialist which is so much more informative and also very confident of his solutions. In the 1.5 months we've been with him, we've already done our first IUI and will be waiting for 3 weeks for the results. *fingers crossed*

If not, Dr's plan B is to do 2 more IUI's then IVF to save time. Also approaching 35 soon (the dreaded fertility drop).
My 2 cents, we all should check with a reputable fertility specialist (that doesn't push IVF all the way like our Dr and tries different solutions) as you never know, there might be some minor issues that can be solved if detected earlier. It's worth the effort in checking first before putting in the years of trying without a direction.