That must feel both exciting and nerve-wracking, so I totally understand why you're watching for signs like that. For me, my mucus plug came out around 38 weeks and I went into labour about 4 days after, but every mum's experience is really different lah. Some ladies lose it and still wait a week or two, while others go into labour quite quickly after. Best to just keep track and let your gynae know so they can advise you based on how far along you are.