I have a question, I use clear blue advanced ovulation predictor, and I have found that the day I get the solid smile face is the only day I can get pregnant (two miscarriages, no live children)

I have found if we BD only on the second day (which is supposedly ovulation day) we will not get pregnant, do you think maybe I just have a short window? There have been multiple months where we missed the first day, but got the second day, and no pregnancy. But it seems most times if we get it on that first day, we are good to go.

The reason I ask is because we BD on the first solid smile day, but I was too tired on the second day. I am kicking myself for missing that second day, but I also feel like maybe it doesn't matter? Thank you!