Any IUI tips?

I am doing my second IUI this cycle. The first one failed last cycle. Last cycle I didn't do anything different besides get the IUI. I kept up my workout schedule, I didn't take it easy on the day I had the IUI (busy schedule). We had sex a lot, including the night before the IUI. I am wondering, is there something I need to change here? I'm doing this IUI (like the last one) without ovulatory drugs and without a trigger shot because my RE doesn't want to introduce those yet since I ovulate so well on my own. My husband has good numbers and our RE is at a loss to explain our infertility. So with that background in mind, anyone have any tips on what I can do to help this IUI along? Should I rest more after? Should I avoid anything? Any advice your doctors might have passed along? I feel like I'm doing this blind!