Ovulation sticks and using fitbit - confused

[Lilyandra]

Hello, this is my second cycle since my miscarriage. As I wasn't sure when I ovulate as my first period took longer to arrive than normal normal I bought clearblue ovulation sticks.
I started on day 9 and had blank face, day 10-14 was flashing and yesterday day 15 was peak face.

My fitbit however says that my fertile window is day 12 to 18, with predicted ovulation tomorrow on day 17. Do I go by clearblue or fitbit. Think I've confused myself.

Go by CB. I also use a FB sense and it has my ovulation day as 3 days earlier than the OPK stated.

When I compared my wrist temp with the OPK findings and the Fitbit ovulation my temp drops and peaks aligned to the OPK.

Currently in the TWW. Good luck