Miscarriage: A termination of pregnancy at less than 28 weeks and a fetus weighing less than 1000 grams is called a miscarriage. Miscarriage is classified by time as early miscarriage and late miscarriage Early miscarriage: Termination of pregnancy before 12 weeks is called early miscarriage. Late miscarriage: Termination of pregnancy after 12 weeks and before 28 weeks is called late miscarriage. Miscarriages are classified as abortion and spontaneous abortion. Abortion: Abortion caused by man for the purpose is called abortion, abortion for short. Miscarriage caused by artificially given drugs is called medication abortion, abbreviated as medical abortion. Spontaneous abortion: Miscarriages that occur in a natural state (not caused by man) are called spontaneous abortions. The incidence of spontaneous abortion accounts for 10-15% of all pregnancies. About 80% of spontaneous abortions occur before the 12th week of pregnancy and are early abortions.