Precum after urination?

No

Precum, is pre-ejaculatatory semen. It is the fluid that ejaculates from a man before the "Big Bang" Although it is a small amount, you should always use protection because you can still get pregnant...

Urination is the release of urine, or liquid waste, from the kidneys. If you are male, your urine comes out of the penis; if you are female, you have a separate urinary opening - both of these are...

Possible, it takes just 1 sperm! . Pre-cum don't always have sperm, it all depends on if he ejaculated earlier and didn't pee! (that cleans the tubes)! and yes it takes only one sperm to get a girl...