Thanks for the query.
I understand your concern.
The possible causes of dark brown discharge in your case are increased blood supply to local genital structures, growing gestational sac damaging the surrounding vessels, spotting on expected date of periods as small gestational sac cannot completely obliterate uterine cavity etc.
Usually minimal discharge with these type of causes will subside soon.
If brown discharge persists and associated pain abdomen occurs better to consult your doctor once and get examined.
By examination and ultrasound the possible cause of the problem can be identified and treated.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.