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It's estimated that as many as 13 out of 100 women who use the minipill will get pregnant in a year of use. The failure rate of the minipill is thought to be higher than that of other hormonal contraceptive methods. In addition, the minipill won't protect you from sexually transmitted infections.

If you become pregnant while taking the minipill, there appears to be a slightly higher chance that the pregnancy will be ectopic — when the fertilized egg implants outside the uterus, usually in a fallopian tube. However, there doesn't appear to be an increased risk of birth defects in babies born to women taking the minipill in pregnancy.

Side effects of the minipill may include:

• Irregular menstrual bleeding
• Acne
• Breast tenderness
• Decreased libido
• Depression
• Fatigue
• Headache
• Nausea
• Ovarian cysts
• Weight gain or loss

You'll need to request a prescription for the minipill from your health care provider.

As long as you aren't pregnant, you can start taking the minipill at any time — ideally on the first day of your menstrual period. Your health care provider might recommend using a backup method of birth control, such as a male condom, for the first two days after you start taking the minipill. You might be able to skip the backup birth control if you start taking the minipill:

• During the first five days of your period
• Between six weeks and six months after giving birth if you are fully or nearly fully breast-feeding and haven't had a period
• Within the first 21 days after giving birth if you're not breast-feeding
• The day after you stop using another hormonal method of contraception
• Immediately after an abortion

If you're switching from a combination birth control pill to the minipill, start taking the minipill the day after you take your last active combination birth control pill.

To use the minipill:

• Consult your health care provider about a starting date. Make sure you have a backup method of birth control available if necessary.
• Pick a time to regularly take the pill. It's important to take the minipill at the same time every day. If you take the minipill more than three hours later than usual, avoid sex or use a backup method of birth control for at least two days.
• Be cautious with missed pills. If you miss a minipill, take the missed pill as soon as you remember — even if it means taking two pills in one day. Use a backup method of birth control for at least two days. If you've had unprotected sex, consult your health care provider about emergency contraception.
• Don't take breaks between packs. Always have your next pack ready before you finish your current pack. Unlike combination birth control pills, minipill packs don't contain a week of inactive pills.

If you're taking antibiotics or you experience vomiting or diarrhea while using the minipill, use a backup method of birth control. If your bleeding is particularly heavy or lasts for more than eight days, consult your health care provider.