Ovulation help

me
I started my period sat nov 21 and ended on tues nov 24. I have this app and another and both said my fertile window starts this sun/mon but i decided to take an ovulation test fri and it said high lh surge then i took one today (sat) and to me it looks like low lh surge. My cm is watery on both days no egg white cm. Can anyone help me out on this one?