Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Miscarriage ?
    ### Response:
    A miscarriage is the loss of pregnancy from natural causes before the 20th week of pregnancy. Most miscarriages occur very early in the pregnancy, often before a woman even knows she is pregnant. There are many different causes for a miscarriage. In most cases, there is nothing you can do to prevent a miscarriage.
    