Positive and hopeful

Does anyone else struggle staying positive/hopeful while going through treatment ? Im on my last round of

IUI

and I keep finding myself thinking of all the next steps we’ll be doing if it doesn’t work but I then tell myself to stop thinking that way and think I will be pregnant, we won’t need to worry about the next steps. I just find it so hard to focus on the positive when I know in my back of my mind there is a chance this won’t work (as it hasn’t for 3 rounds) and I need to prepare myself for our next steps ...