Help, first time opk user

Emily

So this month I took letrozole(femara) for the first time after two miscarriages in the last year. I have never used opk's before and think I may have had my surge today.

I thought it was yesterday night, but late night I woke and had to pee, so I thought why not and then today did not get home until this evening to test. Glow changed my O day to Friday based on the pic from today. I think it will be tonight or tomorrow.