Abstinence is the birth control with the fewest side effects. After that, probably condoms. When it comes to brands of hormonal birth control, the side effects differ from person to person. There's no one brand that is best for everyone.
It is possible to get pregnant when changing birth control pills. If you have not been on birth control for at least 2 months, you should use a back-up method, such as condoms, for the first week of starting your new birth control, to avoid putting yourself at risk of pregnancy.
Mood swings, headaches, breast tenderness, bloating and breakthrough bleeding are common side effects for women taking birth control pills. Birth control pills were approved for use in the United States in 1960.