Mucus plug?! Possible TMI

Can someone tell me how big and exactly what a mucus plug looks like? Ever since I got pregnant I have been dry down there. Like it has been dried up. No moisture at all. I just went to the bathroom because I felt something wet down there. I wiped and there was a glob of what resembles actual mucus from your nose. It was clear and gooey. Well it wasn't coming out all at on I so I kind of pulled it out. It was about the size of the top part of my index finger. I have no idea what it's supposed to look like. It's just weird to have this crap come out of nowhere. I'm currently waiting to see if it happens again. I'm also kind of worried because I'm not full term yet.