When is high fertility ?

SO... this is my first month TTC and tracking my ovulation ...

My period started on Feb 6, and one Clear Blue ovulation test it showed me that I was in “high fertility “ starting Friday Feb 15...

But on Glow with my period Calculation shows me not starting my “high fertility “ week until Today ...

Does anybody have any Advice on when my “high fertility “ days should be ?

This may sound silly but the reason I am trying to track it so accurately is because I know if you have sex with in the first few days of the high fertility you have a better chance of getting a girl 💗