Early early pregnancy ultrasound shows intrauterine gestational sac, there is no obvious yolk sac and fetal buds, fetal heart, 36 days of pregnancy belongs to the very early stage of pregnancy, in the embryo is not stable and easy to be affected by external factors. Early pregnancy is a more dangerous period of time for miscarriage, if there is brown discharge need to consider the following situations: first, consider a priori miscarriage, the occurrence of a priori miscarriage and the embryo itself is not good quality, the pregnant woman’s physical condition is not good, not good rest, emotional stress, environmental factors, low progesterone and so on have a relationship. If the pregnant woman has a reproductive tract or uterine malformation will also increase the risk of miscarriage, you need to combine the above factors for examination, mainly blood test for progesterone HCG, at the same time to do ultrasound. Second, need to consider ectopic pregnancy, ectopic pregnancy is mostly seen in patients with tubal inflammation, ectopic pregnancy can be judged by doing ultrasound, blood sampling, ectopic pregnancy gestational sac is located outside the uterine cavity, the uterine cavity can not be seen in the gestational sac, there are very few cases of intrauterine pregnancy combined with ectopic pregnancy.