Pregnancy more than a month with brown bleeding serious or not, depends on what causes, such as pregnancy itself, preeclampsia caused by not serious, ectopic pregnancy, cervical disease caused by more serious. 1. pregnancy itself: pregnancy more than a month due to the body’s hormone level secretion imbalance, there may be a little endometrial stripping, and then there is vaginal bleeding, the amount of bleeding is relatively small through the oxidation of discharged, will be manifested as a brown color, this is not a serious situation, and the ovarian luteinizing body will secrete more estrogen and progesterone, rapid repair of the endometrial lining, will not affect the development of the fetus. 2. Pre-eclampsia: pregnancy more than one month gestational sac in the uterus bed is not stable, the body’s progesterone and insufficient, may cause pre-eclampsia of the fetus, there will be the phenomenon of brown bleeding, this situation through the supplemental progesterone treatment will not be very serious. 3. Ectopic pregnancy: pregnancy for more than a month the gestational sac did not normally bed in the uterine cavity, bed in the uterine cavity outside the place, at first there will be a small amount of vaginal bleeding, the performance of brown, this situation is more serious, we must terminate the pregnancy in time to deal with. 4. Cervical disease: women themselves have cervical diseases, such as cervical polyps, cervical precancerous lesions, pregnancy for more than a month may also cause brown bleeding, cervical polyps are less serious, but cervical precancerous lesions will be more serious. Whether brown bleeding in a month or so of pregnancy is serious or not, you have to go to the hospital to check and judge.