When is the highest chance to conceive ?

Lupita

Today is my ovulation day and the percentage is 21.2% and yesterday percentage was 32%.. which days is better to try to conceive? I don’t understand how today is my ovulation day but the percentage is lower then yesterday shouldn’t it be the other way around? If I tried to conceive yesterday would it still happen? I took an ovulation test in the morning yesterday and I was ovulating