Ovulation confusion

Stephanie

Sooo I am so new to this whole testing for LH surges and CM testing so I am super confused... my app is predicting my ovulation day is 7/7, I’ve been testing with LH strips daily (when the ovulation window started) and it’s negative like no line at all practically. I also checked my CM earlier and it’s creamy white. My question is, could I possibly ovulate later than the app suggest or could it still happen “on time” ?