I have a UTI & my Dr prescribed antibiotics for it. I first noticed the infection when I got a backache, I have had kidney infection before so I knew it felt like that. I am starting my 5th day of antibiotics and had a.bad sleep last night. I woke up with my back really aching this morning (hurts to stand up for 5 mins). I am wondering if I should be worried that the antibiotics aren't working it if it's probably just the bad sleep.also, I am 28 weeks.