Letrozole and conception ?

Sierra • 21😊, had my rainbow baby (omphalocele warrior 👼🏼💙,early misscarriage on May 28th , 2020 🥺

I’m in 2.5 mg of letrozole , I had sex on cd 11 at 12am and cd 14 at 1am , anyone have sex around these days and end up pregnant ? I had a peak on cd 14 at about 2:45 I didn’t take an opk any earlier I was out of town sadly ! 😩these are my strips and the days I had sex cd11/12 and cd 14/15 .