Brownish cervical mucous at 14 weeks

Li

Hey you guys. Since yesterday I have been having very scant brownish cervical mucous. No cramping or anything like that. Last time DTD was about 5 days ago. Not sure if it could be old blood from that? I have a fetal Doppler and my babies heart rate is just about what it always has been. Should I be concerned? My next appointment is in 4 days