How long after sex does it take to get pregnant?

It varies: if sperm is deposited in the vagina and the vagina is favorable, the sperm that are highly motile can get into the cervix and head up the inside of the uterus and then into the fallopian tube where it will meet an egg on its way down the tube. lots of factors:transit time down the tube for the egg and transit time up the tube for the sperm and processes that enable each to function. hrs-day