More than 40 days pregnant with light brown discharge is not normal phenomenon, the possible reasons mainly include: 1, due to often stay up late, lack of sleep, unbalanced diet, emotional fluctuations and other adverse factors, so that the ovarian luteal insufficiency, the secretion of progesterone level is insufficient to cause the symptoms of miscarriage; 2, suffering from uterine fibroids, endometrial polyps, endometritis and other gynecological diseases, so that fetal development is affected 3. Abnormal development of the fetus due to chromosomal abnormalities in either spouse; 4. Pre-eclampsia caused by uterine contractions induced by strenuous physical exercise, sexual stimulation, and heavy physical labor. Patients should go to public hospitals as soon as possible for ultrasonography and blood HCG tests, progesterone tests, etc., for a clear diagnosis and timely treatment.