No, if the sperm is inside of you they can swim up the vaginal canal.
If The Man Discharge In The Woman And She Gets Stands Up The Same Time And Some Of The Sperms Run Out Back Can That Prevent Pregnancy?
Sperm are WISE.. They are program to go for where the EGG is.. So my answer is it cannot 100% prevent pregnancy.. It still can go inside.. Especially if discharge are close to the woman's opening..