If he used a condom the entire time (no penetration without it), it would be unlikely that you would be pregnant, but not impossible. See what happens when you might normally expect a period. If nothing after a couple of more weeks, you could always try a pregnancy test.
Save yourself some panic and either refrain from sexual activity (avoid getting into a situation where things could go further then you plan), or be sure that both of you are using reliable birth control to lessen the chances of an unplanned pregnancy.
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