Unsure ovu window

Hi ladies, just wanna ask a general question. I was on Mirena for 4 yrs, had one light period for 3 days after it was removed. No period since til feb 2015, then have been getting it consecutively so far. I started tracking my periods via the Ovia fertility app. It said my ovu window was from May 23 to May 28. And an online app says my window was the 22-27. However i was getting the egg white consistency cm til may 30th. I had sex on the 18, 25, & 26. I guess I'm unsure of when my actual window was so I can't determine what dpo I am to know when to take a test, should I wait 2-3 more days til my expected next period and see if I miss it?