I have a bladder infection that started on Friday. I got antibiotics on Sunday - the burning sensation has gone, and the 'urgency' feeling has nearly gone, but I have very bad backache which started around the same time.
No I don't think so. It started off as straight forward cysitis, but I did a long car journey on Friday and we got stuck in traffic - I think holding in my wee for so long made it worse, hence the UTI infection. The backache started on Saturday, but I don't remember it moving around.
I'm assuming you were given trimethoprim? It's probable that your ureters are a little inflammed if they have had wee backed up there (if you know what I mean), you'll be sore for a little while. I would be tempted to pop back to the GP if it doesn't settle in a couple of days and ask about an IVU, which is a series of x-rays which will show up any stretching of the ureters. Ibuprofen should help reduce any inflammation, make sure you have plenty to drink and make sure you go to the loo when you need to and don't make yourself wait.
I'm not a doctor though so do pop and see your GP if you are worried.