Hi there, I have understood your concern. I will suggest you the best possible treatment options.
First of all do not panic.
As you have missed your periods and your
pregnancy test is positive, you can very well assume that you are pregnant,
Secondly, your brown and blackish discharge cam be Due To Some Kind of old bleeding.
Please seek help of Your treating doctor for getting micronized
progesterone tablets and please get USG done to know about the
gestational age and viability of pregnancy.
Take rest.
Meditate regularly, keep cool.
Think positive.
All things will be fine in the due course of time.
I hope this answer helps you. Thanks.
Dr. Purushottam Neurgaonkar.