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Even if he stuck his fingers inside you, and there were traces left on them, it's pretty unlikely that could have made you pregnant. Theoretically possible, but not likely. If he didn't put a finger inside you, just stayed at the labia and clit, then the chance is pretty much zero even if there were traces left on his hand.
But since you are taking things to the next level I would suggest going to your OBGYN and talking about birth control.