what happens if you are pregnant and start taking birth control pills
This is NOT true. If you use birth control pills while you are pregnant, the pill will not cause a miscarriage or termination. The hormones in the pill work to prevent pregnancy by stopping ovulation or by causing the thickening of your cervical mucus. So they have no affect on a developing baby.
For the most part, taking birth control while pregnant will not cause your baby any harm. This is especially true if you have been using birth control pills early in your pregnancy. But, if you have an IUD and become pregnant, you may be at risk for certain pregnancy complications.