yes its a uti I just went through it I know exactly wat ur talking about I had it for three days.I have never had a uti so didnt know symptoms so on the third day the pressure was so bad I started having contractions I had to go to the hospital. its bad for baby so u need to let ur dr know asap so that they can give u meds to stop infection.the discomfort and pain of the pressure will get worst im telling u..
Does it feel like you have to pee every ten minutes? I've had several in the past and what you are describing doesn't sound like a UTI, especially when you said it hurt when you walked. If you feel like you constantly have to urinate, never feel like you are truly emptying your bladder and it somewhat burns when you urinate, that's likely a UTI. Regardless, I'd get it checked out. Those are awful!