Sorry if this is TMI

This morning around 2am I went to the restroom to urinate and since I found out I was pregnant I’ve been so in tune with my body so I check my urine faithfully I noticed some gray & white stringy mucus particles in my urine. However my urine wasn’t cloudy and it doesn’t burn when I go just is there a reason for concern that I had some mucus particles in my urine I’m not use to that?? I went to the ER a few days ago and I didn’t have a UTI they said the pain I was experiencing was round ligament pains but now I’m experiencing cramps and having mucus in my urine I’m 16weeks pregnant