Does interstitial cystitis produce leukocytes in urine?

Hello. I am asking this because I was told by my doctor a couple months back I could have interstitial cystitis. I had about 3 months of a UTI and was treated with antibiotics until they found no more bacteria. I still was having UTI symptoms so they said I have interstitial cystitis. Well the pain went away for a good 2 months. Now its back. By that I mean I feel like I have a UTI but I cannot tell if it’s a UTI or just the interstitial cystitis flaring up? I took a AZO UTI test and it came back Negative for Nitrites and positive for leukocytes. I am now wondering since the nitrite was negative does that mean I don’t have a UTI? Can interstitial cystitis cause white blood cells in the urine and is that why I was positive for leukocytes? Please help if you can!