Oh, even if the ejaculation could have occurred a little directly in the hand itself, it wouldn't survive, right?

Basically, there was no insertive sex - however, my boyfriend is pretty sure he stimulated my clitoris (for a long time) with some cum in his hands, just a few seconds after ejaculating on bed

Hey! Question: does a period nullify any chance of pregnancy from previous sex? Even if it occurred, for example, 7 hours before the period?