Girls, tell me what you think?

So about 2 days ago i had protected sex with my boyfriend and he proceeded to remove the condom after he came, but then he put his penis back it for about 30 seconds to 1 minute and he said that it was still wet obviously. i'm concerned that i may become pregnant after that, so is there a chance or no? a friend of mine said that i can't since it's not that simple for the sperm to go up there, if you know what i mean.
so please tell me something positive because i'm a little panicked
Girls, tell me what you think?
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