Normally between 27 to 30days
Ok keep testing and tomorrow if it goes down then it will label today as peak.
In the same boat. I found this interesting and important info on this. https://www.myfertilityfocus.com/can-you-ovulate-twice-in-a-menstrual-cycle/
The apps are just an estimation, ovulation tests are more reliable. It may mean your body is trying to ovulate now. How long are your cycles usually?