So I went on a long trip to visit my boyfriend who is station away from me while we were visiting we had unprotected sex for only about 5 minutes three days before I was supposed to start my period. He never ejaculated, but just to be safe I did take Plan B One Step 9 hours after we had sex. 4 days after the initial unprotected sex I went to the doctor for a bladder infection and am now on medication for that. My question is, am I just late because of stressing or is there a better chance that I am pregnant?