me and my bf have sex. his first attempt of penetrating my vagina hurts. does that mean that my hymen is present? no bleeding occur.. on our second attempt, his penis entered smoothly into my vagina without protection. is it possible that I will become pregnant? he said he knows when the sperm will come out. the time he felt it, he withdrew, then he masturbate again to make it hard. is there possibility that there are some sperm left and entered to me? fluids comes out in me. he said it's mine. is there any possibility that he did not notice that his sperm came out in me? I'm very worried. please help me.