siuyi,
I didn't have any 啡色既分秘 during my pregnancy. I suggest you not to wait for the next appointment date to see the doctor. Make a new appointment with the doctor for consultation at your earliest convenience.
In the meantime, lay down and rest more.
same as Felicia, I've no abnormal discharge during my pregnancy. If I got the same problem as yours, I certainly would go to see the doctor as soon as possible. Don't waste time, go to consult the doctor and hope that your worries would be settled. Even somebody might say that it's ok lar, but it would be much better to check before the condition turns worse if really getting problem. who knows ??