Blood in Urine

Really frustrated with the lack of communication from my OBGYN and their office. I had a negative UA and the culture was normal but I did have blood in my urine when they tested it. Was told to start antibiotics for it before I got the culture and now that it’s normal I’m wondering why I’m taking the antibiotics and why is there blood in my urine? On call doc didn’t tell me much either! 🙄 And of course it’s the weekend so I can’t follow up with them until Monday. Anyone else have a similar situation happen to them??