Talk to Gynecologist on Cystitis

I went to doctor for menstrual irregularity after marriage..... she suggested me pelvic ultrasound .....that shows cystitis only ...reproductive system was normal having mass....doctor said" k yeh to normal he itna sub ko hta " furthermore I want to tell that just before the start of my periods I see blood only when I urinate this happen for 2 -3 days and after that for next 5 days I have normal menstrual blood flow.......during whole month i doesn't feel any burning sensation and blood in my urine nor any other kind of fluid.......please tell me k kia yeh normal he ?and Jo blood periods shuur hona se pehla mujha sirf urine mein 2-3 days Nazr ata vo kis system se ata urinary or reproductive .... .