Discharge during pregnancy is pretty normal, lalo na after intimacy, kasi the area is extra sensitive and blood flow is increased sa third trimester, pero since you're already 34 weeks, it's better to message your OB about it just to be safe, especially if it looks unusual (greenish, foul-smelling, or may spotting). A few of us pregnant friends had the same concern at that stage, and our doctors were all reassuring once we checked in, so don't stress too much but do get it confirmed na lang!