increased discharge

is increased vaginal discharge normal towards end of pregnancy? I'm constantly changing my panties throughout each day. I know it's not my waters leaking, I have had previous pregnancies & I know what broken waters feels like. I've been having Braxton hicks contractions for a few weeks, they're increasing in discomfort but never consistent. no bleeding, no mucous plug. 31 weeks along if this helps any. sorry if this is a silly question, just curious as to if it's normal. have a doctor appointment tomorrow already for a check up.