Ay, that's quite early na to be 1cm dilated at 36+ weeks with zero labor signs! Honestly, a few of my mum friends had the same thing, one was already 2cm at 37 weeks pero she delivered pa lang ng 39, so it doesn't mean labor is coming soon talaga. The cervix can start opening weeks before actual labor, lalo na kung hindi ka pa nakakaramdam ng contractions or discharge, so walang alalahanin muna doon, pero best to mention it to your OB on your next check-up para ma-monitor lang kung paano mag-progress ang cervix mo.