Question about sex day before ovulation

Niki • 24 - Married 💍 - Country NSW Australia 🇦🇺- TTC #1 👶🏼✨- baby dust and luck to you all 🍀🍀
So I know that having sex the day before ovulation (or the day you get a positive opk test)  is the highest chance of pregnancy.. even more than the day of ovulation. 
I got a positive test and my husband and I didn't end up having that sex that day because he got home so late from work. But we had sex the day before and then the next day (day of ovulation) around midday.
I was wondering how many people have gotten pregnant even though they didn't have sex on a positive opk test day???
Really hope it happens this month and just want to know if I'm in with a good chance!