My 'plug' was very different with my girls.
With DD1 it was grey, stringy & blood streaked. I lost the first bit about 8 hours before my waters broke & the 2nd bit about 4 hours before. I lost it in those 2 parts only.
With DD2 it was white & gluggy & I lost bits every day over about a week.
With DS I didn't lose it at all. I had no pre labour warning with him at all.