short little white items


I have a question, it may be a little TMI....
This is my second baby, I'm currently 28 weeks, my next appointment is may 30th. Everytime I go to the bathroom I find a bunch of white sticky discharge on my underwear. I don't know why ? It's not a yeast infection because I went to the hospital a few days ago and they tested me for yeast and UTI and all tests came back negative. Is it normal? I didn't have this with my first. It doesn't burn when I pee. Just a white discharge. short little white items