I am 17 and I was fooling around with my boyfriend. He came on my stomach (my pants were on). When I put my shirt back on I assume it wiped up the cum that hasn't already dried. About ten minutes later we got naked. His penis may have come into contact with my clit, but there was no penetration. He also rubbed my clit once with the hand he had gotten off with before he came on me. Is there a chance that any "residue" from the ejaculation could have somehow gotten inside me and I could become pregnant?