Tmi. Bloody show. 30 weeks.

I'm 30 weeks Monday. My doctor put me on bedrest last doctor's visit because she said my baby was EXTREMELY low and I'm already a fingertip dilated. Earlier when I was trying to use the bathroom (because I've been constipated) I had got done and went to wipe and I had some mucus with some bright red string through it. Could this be my bloody show? And if it is should I be concerned it coming out with me only getting ready to be 30 weeks?