For a uti - took 2 days of meds than stopped how long till it gets worse and need to be hospitalized?

Maybe no problem: Lower UTI (bladder infection) usually is treated with antibiotic for 3-5 days, but 2 days often is OK. In fact, some infections can be effectively treated in 1 day. Even without treatment, most UTIs don't get bad enough for hospitalization. If your symptoms have cleared up, maybe no more treatment is needed. Assuming you are in a doctor's care, check with his or her office about next steps.