Thanks for your question.
Basically pregnancy is very unlikely, but there is a small chance if there was vaginal contact with semen. This is because if semen came into contact with the vaginal opening, then it is possible, though highly unlikely, that some of the sperm may go inside, creating the possibility for pregnancy.
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Yes, I would recommend a morning-after pill to prevent a possible pregnancy, even though it is less likely.
I would recommend the one containing levonorgestrel. This will prevent the possible pregnancy. This should be taken as soon as possible after unprotected intercourse, and within 120 hours.