pink/brown discharge 35 weeks

I have been having brown/pink tinted discharge for 2 weeks now and I am 35+1 weeks. I have had an ultrasound, screened for infections etc... and my midwife says she isn't worried. But the discharge is increasing in amount and the color is changing from brown to more brownish pink. This is my third pregnancy and I have never had this before. Baby is moving and is healthy. Anyone had this before?