Hello. I have a question. I'm 19 years old. My period is always regular. I had my last period from January 3 to January 8. I had unprotected sex on January 9, but only for a short time (one minute), and the guy didn't ejaculate inside me. I also had sex on January 16, but it was protected. My fertile days were from January 13 to January 19 (ovulation was on the 18). I should get my period tomorrow, on February 1. What are the chances I might be pregnant?