Would the third time be a charm?

My second IUI did not work, and now I have to wait at least a month to do the other IUI because I have a cyst in my right ovary and cannot take any fertility meds.  Part of me feels optimistic, maybe this time we will get pregnant without any meds or IUI, all on our own. But then, the other side of me thinks back to our more than a year journey and thinks... what are the chances of that happening? Either way, I will be taking ovulation tests this month praying to get lucky.