I don't want to sicken you with pictures, but as per my OB/GYN's advice, I am taking pictures of when things scare me so that him and I can discuss them at our appointments.
Initially, the amount and color scared the daylights outta me, but after several tests, it is normal, my plug has remained sealed and intact, despite losing this much of it at around 20 wks along. (now 33wks)
Sorry for the pictures, just curious if yours looked something like this?