Can I get pregnant if I/we have sex upside down is among the most frequent questions asked on the internet. And the answer is yes. Yes you can get pregnant, no matter what your position is. If he ejaculates inside you or sperm gets inside the vagina, pregnancy is possible.
You can get pregnant in any position, while having standing up sex, missionary style, and all the other many variations of sexual positions that exist. It doesn't matter what position you are in, having sexual intercourse can get you pregnant. The sperm can swim in any position and your body naturally pulls the sperm to the egg. You can still get pregnant if the sperm meets the egg. No matter what position you get yourself into, you will still have problems conceiving.
If you do not want to get pregnant, you should use effective contraception any time you have sex.