Ten days after ovulation, nipple color becomes darker, brown discharge may be the precursor of menstruation, may also be the fertilization of the egg or abnormal pregnancy performance. 1. Menstrual precursors: ten days after ovulation, nipples become darker in color and brown secretions may be a sign of the onset of menstruation. Before menstruation, due to increased hormone levels to stimulate breast hyperplasia, there will be breast swelling and pain or nipple color darkening phenomenon, brown discharge is considered to be a small amount of endometrial shedding caused by the general with the large area of shedding will be transitioned to the normal menstrual blood discharged. 2. Fertilized egg implantation: ten days after ovulation nipple color becomes darker, vaginal brown discharge may be the performance of fertilized egg implantation, fertilized egg implantation stimulate a small amount of endometrial shedding, will form a brown secretion discharge, coupled with the pregnancy estrogen and progesterone increase, will lead to deepening of the color of the nipple, belong to the normal. You can use early pregnancy test paper or check blood HCG clearly. 3. Abnormal pregnancy: If there is no contraceptive measures during ovulation, you may be pregnant, ovulation ten days nipple color darkening, vaginal brown secretion also be alert to whether or not the aura of miscarriage or ectopic pregnancy caused by. You can combine blood HCG, ultrasound and other tests to clarify, according to the specific circumstances of the symptomatic treatment. The nipple color becomes darker, the vaginal discharge brown should pay attention to avoid sex, more rest and observation, the best combination of ultrasound and blood HCG examination to clarify whether there is an abnormal situation, give symptomatic treatment.