I have recently started getting UTIs after sex with a new partner (4 UTIs in past 2 months). The previous UTIs were cleared up after a 3 day course of antibiotics. Recently I got another so I had a 3 day course of trimethoprim, nothing changed so my go gave me a 3 day course of nitrofurantoin. But I still have constant pressure on my bladder and the feeling that I need a wee. Also the dipstick test done by the gp is negative so she says there are no bacteria and no sign of white blood cells either, indicating that there is no infection. My urine was sent off for a culture, but this came back as completely normal too. My gp is now organising an appointment for an ultrasound, but I still fee like the symptoms must be to do with the original UTI! I'm losing my mind about what to do and am in fear that I will feel like this for the rest of my life. I'm only 23 and it's really getting me down. Any advice on what might be causing my symptom of constantly needing to wee?