During se-xual intercourse, sexually transmitted infections can be transferred from one person to another. This implies that you won't get the disease from having se-x with your partner if neither of you has one and neither of you has done it with anybody else.
The birth control pill prevents the union of a sperm and an egg. Fertilization is the process of a sperm joining an egg. The pill's chemicals effectively prevent ovulation. A pregnancy cannot occur if there is no ovulation since there is no egg for the sperm to fertilize.
Really effective birth control drugs can stop pregnancy. When used correctly, that is, without skipping a dose, they are most effective. But doing it can be challenging. Every year, 9 out of 100 women who use pills become pregnant.
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