realy confused! please help!

Eiman
According to averages, I was supposed to ovolute on 23rd of May.But I took opk's which started to be positive since Monday19th of may until wednesday 21st of May.I cant decide when to start counting days post ovolution!!!!! should I trust the opk results? or follow the date according to the apps counting? please girls....help me decide...I am totally list.