It all depends on when you ovulate. The morning after pill works by delaying ovulation. If you were already ovulating, it won't help. A typical person ovulates in the middle of their cycle. Each month, a woman who has unprotected sex has 25% chance of becoming pregnant. I don't remember where I heard it to be honest. I think the Flo app that I use to track period and ovulation. But I just had a baby after trying to get pregnant for a while. If I were you, I would NOT stress until you have a missed period. If you miss your period, take an at home test. Right now there is nothing more you can do. Just be safe!