When you are pregnant, taking birth control pills will generally not cause abortion, but the estrogen and progesterone components of birth control pills may affect fetal development and lead to the occurrence of fetal malformations, so it is not recommended to take birth control pills after pregnancy. At present, contraceptive pills all contain estrogen and progestin components, these components enter the maternal blood circulation, will enter the fetus through the placenta, affecting fetal growth and development, and easily lead to malformation of reproductive organs. Contraceptive pills generally do not cause uterine contractions, so they do not cause abortion to occur. If you want to abort your pregnancy, you can take abortifacient drugs, such as Mifepristone and Misoprostol, for early intrauterine pregnancy within 49; you can also choose abortion surgery, and the specific suitable method needs to be decided by a professional physician after a comprehensive assessment.