Blood in urine

Angel 💋 • Due March 15th with baby Kaiden💙
I'm 32 weeks pregnant today & for the past few weeks I've been told by the nurses at my appointments that I have blood in my urine. I've been checked for all the infections & all came back negative. My doctor doesn't seem concerned at all but it still worries me. Anyone else have this problem? Was there a problem with it later on? I just don't understand why there would be blood if nothing's wrong. Someone help me out here 😞😞😞