Did the pill work?

Hello, so I had unprotected sex with a guy and he finished inside of me. I took the emergency pill that night but I didn’t know it doesn’t work if you take it after ovulating. I’ll wait a few days to take a pregnancy test but do you think I might be pregnant? No symptoms, the only thing going on is that everything I eat makes my stomach sick and I’ve had nauseas but like two days at night, nothing more. My last period started on Aug 21. Thoughts?