or rectum....whatever its called
he would have to ejaculate more than usual for it to leak outside and then over to your vagina. your anus is quite long. its not likely you are pregnant from anal sex
I suppose that is true that it can leak into your vagina. Just wanted to mention that there is no way that semen lives up to seven days, more like 72 hours in the vagina and only if the cervical mucus needed is present.
Sorry to contradict what GRose said but if semen has leaked out of your back passage or pre-*** has touched the vaginal area (even the perinium, bit between vagina and anus)then it is possible to get pregnant, it does not matter what poisiton or getting up right away, the safe way to make sure this does not happen is to wear a condom. Semen can live up to seven days and they are also present in pre-ejaculation (pre-***). If you are having anal sex, please be aware that you can still catch STI's. So use a condom! Don't panic too much and if your that worried seek medical advice
First off how did he barely ejaculate? No, you can not get pregnant from anal sex, your reproductive organs are not connected to your anus.