The risk of having a miscarriage due to taking birth control is minimal, according to the Mayo Clinic. It is important for women to consult with their doctors before taking any medication during pregnancy.
According to the Mayo Clinic, the hormones found in birth control have little or no effect on a developing fetus. It is recommended, however, that women stop taking the medication as soon as pregnancy is discovered to ensure the health of their growing babies. It is also advisable to inform a doctor if birth control was taken after conception and for how long.
According to Atlanta Gynecology and Obstetrics, up to 20 percent of pregnancies result in a miscarriage. Eighty percent of these miscarriages take place during the first trimester. The leading causes of miscarriages include blood disorders, infections and chromosomal abnormalities.