Would my precum have sperm if i urinated after my last ejaculation?

Ejaculation: It is highly likely there is some sperm,as it is in real time release of sperm and not what was left from a previous ejaculate .

Potentially: Most studies have shown low levels of sperm or no sperm in pre-ejaculate with sperm not being motile (however, don't know how promptly samples were examined). One small study published in 2011 showed that there are some individuals with a high motile sperm count in pre-ejaculate. See: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3564677/