Ovulation after app says it will happen?

Jocelyn • TTC #1
Not sure if the app has my algorithm wrong but according to my ovulation calender on here, I was suppose to ovulate sometime over the last 5 days. I also check my cerival mucus. I had some sharp mittelschmerz pains and egg white mucus this afternoon. As far as I know, that should mean I'm ovulating now. Is this app off or am I misinformed? Anyone else have this issue?