Talk to Gynecologist on Brownish Discharge

Dear dr. I m 9 weeks pregnant. From last 2,3 days im noticing darkish brown discharge in urine. Earlier it was sort of white creamy discharge, now it is brown. Don't have any pain or cramps. Just afraid if its a sign of missed miscarriage because my ultrasound at 7 weeks showed no heartbeat. I was adviced to wait and watch n then repeat ultrasound after two weeks.