Hi, I understand why this is worrying you. Since you're early in pregnancy and noticing this after your scan, this one better not wait, please go see your doctor or call the clinic to check in, just to be safe. They'll be able to look properly and put your mind at ease. Sending you all the best.
Brown discharge is normal. Just make sure it’s not bright red like menses and no unbearable sharp pain. You can consult a gynae for a peace of mind! Should be able to scan for fetus on ultrasound soon.