They can be a variety of colours (yellow, brown, pink, clear, green, etc.) but they usually look like a big sticky gooey glob of snot.
Sounds like a normal discharge. As long as it wasn't cottage cheese type. Google some pictures and see if that helps.
Mine was a clear jelly stringy type blob
Mucous plugs can look different in every pregnancy. But if your having something that's clear and watery, it could be amniotic fluid. I would call your doc and ask.
It can be brown looking mucous... not necessary blood.... good luck