TMI in the answer as well....
so WARNING WARNING... lol
I gave birth twice. The first time I don't recall even knowing a mucous plug existed and was still clueless about it when I was pregnant with #2. But, about 2 weeks before I went into labor with our 2nd baby, I lost my mucous plug. BUT, it wasn't a small little whitish substance. It was more like a jellyfish. Seriously. It didn't seem small (or didn't seem that way at the time, lol) and was really slimy and rather opaque..... like a jelly fish you'd find washed up on the beach. I have lived in Jacksonville (since I see you are from Fleming Island) so I am referring to exactly the kind of blobs you'd find on Jax beach or St. Augustine, lol. A little smaller than what you'd find on the beach, but the same appearance color wise and slimy.
But, that said... if you have ANY concerns about what it was or if you should worry, please contact your doctor's office. They are familiar with your individual circumstances and pregnancy. We aren't.
I hope this helps, and God Bless you and your baby.