If you are a woman who is taking birth control pills, you are usually  99.9 percent protected from pregnancy.  Birth control pills, however,  will not completely prevent pregnancy for women who are sexually active.

These pills are essentially hormones.  What they do is alter the  body’s natural hormones slightly, preventing an egg from being released  from the ovaries each month.  When no egg is released, no pregnancy can  occur.

READ MORE HERE:- How Birth Control Pills Prevents Pregnancy

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