Small, white clumps in discharge?

Samantha
I had unprotected sex the day or two after my period. A few days ago, I took out my Nuva Ring to reposition it and I noticed a lot of little white clumps around it. They didn't really look like cottage cheese, but more like quinoa (weird and gross to think about I know!). There isn't an abnormal smell in my typical discharge. No itching. No burning. And the typical discharge doesn't really have the clumps in it; maybe one or two or occasion.
At first, I thought it was a yeast infection. But I took an acidity test and it was negative. Does anyone have any idea what this could be?
Thanks in advance!