Experience labour symtoms at 37 weeks

The most definite sign for impending labour would be contractions! Second will be waterbag breaking. Though breaking doesn't mean labour will be immediate, you'd likely still need to check into the hospital for surveillance to make sure that baby is doing alright and is not pooping inside. I was told by my gynae to look out for these two signs. As for mucus plug and bloody show, labour may not happen up till days.