Good job elevatedconcep.
The first attempt at subbing is always the most anxiety laden one. Thats why its smart to practice before hand to get it down right. Peeing with dirty pee is never a good idea to warm up a collection cup. You got lucky.
If it ever happens again and the temp is a little low, just rub your thumb against your clothes for a couple seconds, then hold your thumb against the temp strip for a couple second. When it reads 98 step out of the room.