Can you still be pregnant if had a tampon in and the guy came on your leg?

No, it is not possible to get pregnant if the man ejaculated on your leg, even if you had a tampon in. Pregnancy can only occur if sperm comes into contact with an egg, and since the man did not ejaculate inside your vagina, there is no way that sperm could have reached your egg. Additionally, the tampon would have prevented any sperm from entering your uterus even if he had ejaculated inside your vagina.