I made a stupid mistake and had unprotected sex on Friday 17th of Feb. I finished my period earlier on that week on the Monday the 13th of Feb. Now I've had sore boobs for a good few days which is extremely unusual for me. I've also been experiencing cramping in stomach similar to period pain. I don't know if this is all in my head as it seems unusual to get symptoms this early but I feel like an absolute paranoid wreck. It got to the point I couldn't handle the anxiety so took a pregnancy test today 28th of Feb which was negative but it was only 11 days after sex so would probably be too early to detect. Do you think this window of having sex so close to my period ending is unlikely to result in pregnancy?