You dont have any chance of being pregnant unless he ejaculated inside of you, not your anus.

Iam not an experienced person as such and I am replying because of what the doctor told me when I was a young teen and he gave me a sex talk dont know if he was just trying to scare me but he said that if a guy ejaculates into your bottom you wont get pregnant but if some dribbles down into your vagina you have a very slight chance of getting pregnant but I wouldnt worry too much just waite for your period and only worry if you get symptoms of being pegnant and u dont get your period and if you are worried about getting pregnant so young then maybe you should consult your doctor and go on birth control because even if you are having safe sex condoms can break and it is much safer to be on birth control and use condoms. I was 17 and on depo and using a condom and I got pregnant without knowing until I actually miscarried and got really ill. I m not saying this to you to be scary or mean I am just telling you from personal experience and I care because of the heart ache I went through and do not wish it on any one.

You can't get prego unless you have sex with some and the penis is inserted into the vagina and then he cums.