Spermicides should be put inside the vagina within before intercourse.

Spermicides should be put inside the vagina within 1 hr before intercourse. 
Spermicide is a kind of birth control that has chemicals that stop sperm from reaching an egg. It should put inside vagina before sex to prevent pregnancy. It prevents pregnancy two ways: blocking the entrance to the cervix so sperm can’t get to your egg, and stopping sperm from moving well enough to swim to your egg.