Third Trimester: Discharge as a Labour Signal
White discharge in the third trimester can take on new significance. As the body prepares for birth, discharge patterns shift in ways that may signal approaching labour.
Toward the end of pregnancy, particularly from 37 weeks onward, the mucus plug that has sealed the cervix may dislodge as the cervix begins to soften and dilate. This can appear as a large glob of thick mucus, sometimes tinged pink or brown. This is called the bloody show. It can happen days or even weeks before active labour begins, so losing the mucus plug alone is not a reason to rush to the hospital.
A sudden gush or a steady trickle of clear, odourless fluid is a different matter. This could mean the amniotic sac has ruptured. Unlike ordinary discharge, amniotic fluid keeps leaking and cannot be stopped by clenching muscles the way urine can. If you suspect your waters have broken, go to your maternity unit immediately, regardless of whether contractions have started.
White discharge in the third trimester: labour signs are real, but not every increase in discharge means labour is imminent. When in doubt, call your doctor rather than waiting.