I would say the best chance would be to BD on both days of the egg symbol. Statistically, the first day is the best and the second day is the second best. However, managing to BD on either day means that you are in with a chance.
NOT managing to BD on either day means you would have had NO chance.
So, missy
you can count yourself in.

You already know this I think but I suspect you're having one of the usual panic attacks around ovulation that we all have. Especially me, I tend to have minor heart attacks if I don't get it exactly right.
Sending you lots of

and wishing you good luck.