Pregnant? Menstruation?

After pregnancy, menstruation will not come. Because the level of estrogen in the body after implantation of fertilized eggs is very high, so there should be no menstruation throughout pregnancy, but there are also some women who bleed after pregnancy, this bleeding is not menstruation, for example, bleeding during early pregnancy, first of all, except for threatened abortion, then also to give certain treatment. There is also, can do a fetal heart monitoring, that if the embryo is not well developed, there are some bleeding symptoms, this time, can consider the child is not well developed, there may be the final result is to abort. Secondly, bleeding during pregnancy, but also to see if it is caused by cervical polyps.