It could be a small part of your mucus plug or it could just be a slight change in the discharge, or possibly an infection (if you have had itching or burning when you pee or just around your vagina)

Doesn't mean anything is going to happen but as always, if your concerned go see your Dr, Gp or MW, even if you saw them this morning just go again if your worried - that is what they are there for.

Nae x