Ay mama, at 38 weeks kailangan mo talaga ng peace of mind on this one, best to message your OB or go in para ma-check nila, kasi ang brown discharge/mucus plug situation ay dapat sigurado, lalo na ngayon na malapit mo na! One of my mum friends had something similar at sabi ng doctor niya normal lang discharge pa, pero may isa namang kaibigan ko na that was actually the start na, so really kailangan lang ma-assess ng doctor mo sarili to be sure. Wala kaming way na malaman for certain dito sa Facebook, pero your doc will know in a second, don't overthink it, just send them a message or call na, okay?