Oooh momshie, at 39 weeks yan most likely ang mucus plug na! Normal lang talaga, it means your body is preparing for labor, a few of us moms noticed it a few days or even weeks before we actually gave birth, so hindi automatic na time to go to the hospital pa, pero definitely keep your OB updated especially kung may heavy bleeding or cramping along with it, kasi they need to monitor kung lapit na talaga or if something else is going on. Good luck, mama! You're almost there na!