answer:I’m hoping someone more qualified than myself comes along shortly, but it gets pretty slow here at night so wanted to jump in quickly. Your appendix is in the lower right side of abdomen. Symptoms would be more severe than a UTI, but it’s always the first thing I think of when someone has pain on the right side. Maybe read up here and see if some of the indications fit. I mention it just because you should see someone immediately if it fits. Early pregnancy can also cause an urge to pee and lower back pain, but abdominal pain would be less likely, is that a possibility? Of course you know if the pain gets worse, you get a fever, you feel nauseous, or you feel something might be really wrong get in to see a doctor ASAP. Emergency rooms and some minor emergency clinics are open 24 hours and could tell you far more in the few hours it takes to be seen than we will be able to here. Even if the pain goes away, definitely call your doctor on Monday to update them and hopefully get your results.