I'm 17 weeks pregnant have lost some of my mucus plug now having brown discharge? is this okay or should i go in?

Probably ok: There is not an actual mucus plug that is in the cervix, rather the cervix produces mucus as part of the hormonal response to pregnancy. If there are no other symptoms other than discharge, it is probably ok to wait. If there is pain, cramping, vaginal irritation, a foul odor, or anything other symptom, make an appt with your ob provider