38 weeks still working

Hi mummies, issit normal that there's still no signs of labour yet at 38 weeks? And I am still working, I'm only starting my ML on week 39; is it safe to do so? I'm so worried... I've been walking a lot and hope that does not trigger anything. #pleasehelp #advicepls #firstmom #firstbaby #firsttimemom #FTM