Some people need to be taught about sex.

If the cum is dry then it's dead. But if the cum is wet then yes you can get pregnant. It can slide down into your vagina and get you pregnant. So if he cums on your vagina, ass, back, belly, tits it can slide down and if it reaches the inside of your vagina while it's still wet then there's a chance you can get pregnant. if you're giving a hand job and get cum on your hand then rub yourself you can get pregnant. if you don't have any protection then you can get pregnant from precum. The best way to prevent pregnancy is no sex at all. The second best is condoms. (Chance of pregnancy if it breaks) Condoms also protect from most stds. But do know they don't protect from all. Even with an intact condom there are stds that can be spread from skin to skin. Then there's birth control that also protects from pregnancy. But there's still a small chance and birth control does not protect against any stds. Please research everything before having sex so that way you can have fun safe sex.

Edit: a lot of people don't understand the word can. There's a chance. Doesn't mean you'll get pregnant from anything above but it also doesn't mean you wont. You very much can. Sperm dies when dry, remember that.