Normally, if a spontaneous abortion occurs on the 30th day of pregnancy, the majority of cases will be characterized by bleeding and abdominal pain, when there is usually a large amount of blood clots, among which some patients will see white fleshy embryonic tissue. Therefore, if you are 30 days pregnant and you feel different from your period, and there is an obvious abnormal bleeding, you can go to the hospital for an ultrasound to see what is going on in the uterine cavity. You can also determine the embryonic condition indirectly by drawing blood to see the blood HCG level and progesterone. Normal early pregnancy blood HCG doubles every other day and progesterone gradually rises, which means the embryo is developing well. If there is bad doubling of HCG, bad rise of progesterone, bleeding and abdominal pain, you must go to hospital for relevant examination. If there is not much bleeding, there is a hope to keep the fetus as much as possible and treat the symptoms. If there is unavoidable miscarriage, treat it symptomatically according to the situation.