I had butt sex can I be pregnant

He came inside my butt and it may have gotten in my vagina but I'm not 100 percent sure please help , I'm scared . 
Update : thanks for everyone who gave me good advice and for you who are being rude , I don't have a parent in my life who cares enough to even teach me about this kind of stuff . By real parents died when I was 6 . Thank you for everyone that was nice .