Plan B, Fertilized Egg, implantation.

Ladies it’s my first time posting here but I really need help. So I’ve been feeling tingling sensations on my right ovary. And last night I felt like my uterus was really warm but when I touched it I couldn’t feel the warmth I was feeling inside. But I’ve been having sex quite often this past week and on my fertile window. Has anyone felt what I have felt what I’ve recently and ended up pregnant? I’m asking because I feel like I am pregnant or at least a few days into conception but my boyfriend wants me to take Plan B because a few hours ago he finished inside me. Does anyone know if I might be pregnant but implantation hasn’t occurred and if so will Plan B affect it. HELP !!!!