I had an unprotected sex with my partner last night but he didn't ejaculate inside me but I think a drop sperm had fallen in the fringe of vagina or the outer part of the vagina that might not have gone inside. Today in the morning I ate I pill but I also came to know that tha sperm can live inside vagina for some days. I have to ask you if the sperm didn't enter the inner part of vagina, how can the contraceptive pill be useful and I have a fear that the sperm can go inside vagina after some days or hours after taking (i pill) if it still is present in the outer part of the vagina. Maybe I couldn't explain it properly but I hope you understand my concern.