I'm 16 yo. Me and my boyfriend felt in a mood so we tried for the first time a very stupid thing. I put his penis inside my butt cheecks and then it will touched my vagina for maybe 5 seconds or so. His penis was dry, no pre cm or cm at all. I'm a virgin and he is as well. I took my first birth control and I'm gonna have second just to be sure. Is there any possibility I can be pregnant from that? THANK YOU