it's not sperm that "leaks out". it's the semen. the sperm is in the semen. don't worry once the man ejaculates the little swimmers know what to do and where to go.
yes, it is absolutely normal and you can get pregnant. No semen will stay in vagina after the intercourse without leaking out, some amount always leaks out, it is natural and there are still many, many sperms which remain in vagina and they can do their job perfectly.