Hi mama! Any brown discharge in the third trimester can be tricky, please see your OB as soon as possible or go to emergency kung pakiramdam mo ay may ibang symptoms pa (cramping, bleeding, pain). Hindi ko magagawang masiguro kung normal lang yan without proper check-up. Better safe than sorry, lalo na ngayon ka na at 33 weeks! Sabi ng isa sa mga mommy friends ko, dala lang namin sa hospital even small concerns at OK lang, peace of mind lang yan para sa baby. Take care, ube!