I agree about the vet. We had a black half siamese cat long ago who would let us know when he had kidney problems. He would go and pee in the sinks, so we would see the blood in his urine. Off to the vet we'd go (with him screaming at full volume in his Siamese voice) and after a few doses of antibiotics he would be fine for anther year or two.
Maybe your fur kid is hurting and can't get your attention any other way. Simply shut the bedroom door and see if he pees anywhere else inside.