Ashley;

Tonight while getting ready for bed, I noticed a wet spot on the floor of my bathroom I determined to be cat urine. When I was cleaning it up, I noticed that it had a pink tinge to it. I went back down to look at the litter box and I didn't really see anything pinkish in there. (The litter box was due to be changed and one of my cats is a bit fussy when it comes to that.) Both my cats are acting as they usually do, eating, going to the bathroom, etc. (read: running around like maniacs.) I can't tell which cat did it and since they're both acting fine, I'm at a bit of a loss for what to do. I read up on UTI symptoms and they don't show any of those. Do I take them to the emergency vet tomorrow or will waiting until Monday to make an appointment with the my regular vet be fine? They are due for their yearly checkup this month and I was planning on making that appointment this week. I appreciate any help. Thank you in advance.