Stool Calprotectin test. Flare up also?

I'm in remission of ulcerative colitis since may 2023 UC was diagnosed in Dec 2022. Last colonoscopy done in July 2024 which was normal. Now currently having symptoms often burping and buttock pain on the right side which slightly radiates to the knee as well. I got UTI now where the symptoms were ignored for almost 15 to 20 days Currently on ofloxacin 200 for uti tat goes on for next 2 days and Nexpro L 40 and dortin plus SOS which was last taken yesterday night. Wanted to order stool Calprotectin test. How many days should I wait after stopping antibiotics and PPI to go for stool Calprotectin test. Do these medications affect the results? Also wanted to know does this test pick up mild flare up also? Can UTI cause buttock pain. Not able to understand what's happening inside me cuz every symptom I feel is like cross connected. Feeling anxious too. Crp is normal, ESR when checked on 25th Sept was 70, on 29th dropped to 24. Pls guide about the Calprotectin test. As it's a costly test