Another IUI on the Horizon...

I've got one follicle growing still and am due to have another IUI likely in a few days. We've taken  a year off since our last tries with follitropin injections. The emotional rollercoaster was too much. We did 3 IUIs in the past and one other cycle that failed. I want to be hopeful. It is is hard. My husband is trying to be extra hopeful these days.
Last Sunday, we were encouraged to write down something we knew we should give to God. I wrote down "my infertility". This is a constant battle for me as it constantly weighs on me and I need to learn to daily give it to God. I want to be okay with whatever He has for my future...but I want to have children so badly. How do I get to that place of being content no matter what happens in terms of my fertility? I trust God, but how do I TRUST GOD fully???