Quoting ★311161.69★:" You'll know you're in labor when you've been having contractions that are 5 minutes apart- lasting 50-60 seconds for over an hour. Don't be scared to start labor at home. I did and so do most women."
also, OP, when you lose your mucus plug, it looks like a big chunk of thick boogers. sometimes it's white or yellowish, sometimes it has a little blood on it. but losing it doesn't mean you're in labor. you'll know when it happens. just wait for those contractions to be 3-5 minutes apart and lasting about a minute or more each for one hour.