Possible blockage: act now
What you may notice
Repeated tray visits, straining, crying, genital licking and increasing distress can occur. Vomiting, weakness or refusing food can mean a cat is very unwell. Straining can be mistaken for constipation. If you cannot tell whether urine is passing, describe that uncertainty to the emergency clinic now.
Do not turn it into a home test
Do not press the belly, try to express the bladder, give leftover medicines or wait for a water trick to work. A water log cannot rule out obstruction. Call the clinic and follow its transport instructions; take your cat in a secure carrier without delaying for a sample.
Why the urgency matters
Cornell and International Cat Care describe obstruction as life-threatening, with rapid deterioration and potential kidney and electrolyte problems. Treatment may involve pain relief, a urinary catheter and fluids at the clinic. Which treatment and follow-up are needed depends on examination, not an online checklist.