TTC- sex before ovulation

Leimaluhia

I read that it’s better to have sex 1-2 days before ovulation so there’s sperm by the time your egg drops. Well… rechecking two months in a row we had sex the day before I was scheduled to ovulate. Is there something else going on? Or is my <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation calendar</a> just wrong?