What are the most important days for success with iui

Hayle • 5 yr old daughter. 1 👼🏼 1-23-19. Ttc baby #2.

So I had one successful iui in December but ended in a miscarriage. I wasn’t working then. Now I’m on nights and want to make sure I do everything I can to make it successful & take it easy. What days are the most important for success?