Is It Normal to Miss Your Period When Switching From One Birth Control Pill to Another?

It's normal for women to miss their periods when on birth control, regardless of brand or type, according to Planned Parenthood of Maryland. Switching types or brands is a common cause of missed periods.

Taking a birth control pill once a day, every day, creates 99 percent effective protection against pregnancy. If a woman is taking her pill daily without missing or skipping doses, it is very unlikely that she is pregnant. She may be experiencing secondary-amenorrhea, a medical condition in which a woman doesn't menstruate for six months or more. Switching birth control methods or brands is a common cause for missed periods, especially if the pill contains progesterone, according to the Palo Alto Medical Foundation.