I'm a bit worried because I had unprotected sex for the first time on Thursday, May 18th, and it was pretty deep. I think my period started the next day or maybe Saturday, and it stopped by Wednesday. It was really heavy for a couple of days and then kind of light. Is there a chance I could be pregnant?
Based on the information you provided, it is possible that you could be pregnant since unprotected sex occurred during your fertile window. To confirm pregnancy, you can take a pregnancy test. If you are concerned about potential pregnancy, you can consider taking an emergency contraceptive pill like Plan B One-Step within 72 hours of unprotected intercourse to reduce the risk of pregnancy.