Need help to understand.

Cass

My husband and I have been TTC for a year now and I have had two surgeries for endometriosis (last one a year ago)

I am using the Clearblue ovulation advance kit and it read 3 days of high fertility and today (the 4th day) peak. Every calendar / app I use say I should not peak for another 4-5 days.

I can not find any information on why or if it’s common.

Any information would be very helpful. Thank you so much!