How far along are you? If you are close to your due date, then it's probably going to start soon. Days...maybe a week or two.
If it is still early, your plug can grow back. So seeing a chunck of mucous plug doesn't always indicate that you will be going into labor.
This is my 8th pregnancy and my worse I hope it's soon
It could be soon, or it could be another week. Some women lose their plug early.