There is no way to know for sure whether there is sperm in pre-cum. We really can't make any predictions about that, and to get a definite answer you'd have to take a sample and put it under the microscope.
So, the best thing to do is always to assume that pre-cum may contain sperm and protect yourself accordingly.
We do know that the chances of sperm being present are much, much lower if someone has urinated since the last time they ejaculated. Since the way that pre-cum can contain sperm is by picking up any that are left-over from a previous ejaculation on the way out, you can be fairly sure that that wouldn't happen if you've "flushed" any left-over sperm out with urinating.
-------------------- Johanna Scarleteen Volunteer
"The question is not who will let me, but who is going to stop me." -Ayn Rand Posts: 9192 | From: Cologne, Germany | Registered: Sep 2005
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