Ttc w/ irregular monthly.

Okay so I'm ttc.. period was 4/21/17 I Ovulated between May 1-8th. Let's say this month was a fail for me (I'm sure it was) My period is due today. If it doesn't come how will I know when to try again for a baby? My periods lately have been every other month so if it stays that way, I won't get one this month. But doctor said I ovulate.. even w/o a period.. (she ran blood test and said the day I came in I was O) but that was in January/February. I'll know for sure Monday if I ovulated correctly this month. But I'm nervous this was literally my only chance to try for a baby until idk when. I'm confused and ugh... Advice???