When a woman does not have her period when it is due, and only a small amount of coffee-colored material appears, the first thing to look for in this case is whether or not she has had sex. If there is sexual intercourse, you must test the paper immediately to see if you are pregnant. If you are pregnant and a small amount of coffee-colored material appears, consider it to be a sign of pre-miscarriage. In this case, if you do not want, you can wait half a month and then go to the hospital gynecological examination ultrasound to see the size of the gestational sac, and then terminate the pregnancy. If you want to have a baby, you can go to the hospital gynecology department immediately to check the blood HCG and progesterone status to see how the baby is developing. If you are not pregnant and simply have a small amount of coffee-colored material, consider that the menstrual lining is not flaking well, causing a low menstrual flow. So in this case, you can take Yimu Cao granules or Blood Mansions and Stasis Pills to let the lining peel off completely for menstruation.