I just got my mouse a week ago. Today I found a wet pink colored spot in his.cage. If this is urine (which I'm assuming it is) is he bleeding?!?! It was pink not red. The only other thing I can think is that his food has some naturally colored pieces in it.
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Firstly, well done for being so observant! It really pays to check pets and their housing daily.
Does he have any beetroot in his diet or any other artificially coloured biscuits? You could try soaking a bit of the food in water to see if it produces the same colour and if so (and your little mouse doesn't otherwise look unwell) then you can breathe a sigh of relief.
It's definitely worth checking him all over as the others have said if he looks less active than usual.