My Chibi hates a bath, but he's a dirty boy and gets one a week! Often after the bath and dry he goes wee wee where he isn't supposed to...ie on the carpet, couch ect... So we usually put him in his pen for a while after a bath and let him come down.
I've heard too that when they go wee wee more than usual and not in the right place even if they are trained then they could have a UTI. But, just watch your little guy. If he keeps going a lot where he is not supposed to, or just going a lot, maybe it's time for the vet. We haven't experience a UTI yet, so we haven't had first had experience, maybe someone else has...
I hope he feels better soon!