Hi,
Welcome to ehealthforum,
Why would you want to 'cause' a miscarriage? It is not legal to go ahead for abortion, unless it the pregnancy is affecting mother’s health severely, has been a result of assault/rape, or if the fetal development is not normal and will affect the quality of life after birth and other conditions. If you are not ready to continue with the pregnancy (and want to terminate it/go ahead with abortion), visit your doctor/gynecologist for further evaluation and assistance. Based on your health condition, medical background and gestational age, appropriate treatment options would be suggested.
Take care.