Is this part of my mucus plug? I'm only 28 weeks and I know it can regenerate but I'm just curious.

Doesn't look like mucus plug to me. Looks like excess vag discharge, which is normal as long as no other symptoms. 

Yep!! 

looks like discharge i'm 39 weeks went in hospital for 6 hours done all the checks and sed everything is fine mine was the same thing and found that i thrush aswell just gave creamdouble check wid ur midwife or dr just incase .

Its a piece of it

It might be but as long as your not in pain or leaking fluids you should be good mucus plugs grow back :)