I feel for you, during my last pregnancy, I had about 20 uti's and a few of them had me in hospital because we all thought I was in labour. Even thinking of it now brings tears to my eyes. If it's still hurting like that, I'd suggest going back to the hospital. How long have you been taking antibiotics? If it's more than 3 days they should have started working by now, paracetamol is safe during pregnancy (unless you have a medical history with it) xx