Also pregnancy can cause dark
urine because of dehydration. I went most of both of my pregnancies with dark
urine cuz of dehydration even though I was drinking plenty of water.
Hubby n I have used spit before because we ran outta lube, and it's never effected me. But remember that the mouth is one of the most dirty areas on your body. LOADS of bacteria in there. And if he's sick, that makes it even worse.
I would avoide using spit ESPECIALLY while y'all are both sick.