Yes, a girl can get pregnant even when using birth control, though the risk varies depending on the method and how consistently and correctly it is used.
While birth control methods are designed to prevent pregnancy, they are not 100% effective. The effectiveness of birth control is typically described in terms of "typical use" and "perfect use." Typical use factors in common mistakes or inconsistencies in usage, while perfect use assumes the method is always used exactly as prescribed.
Understanding Birth Control Effectiveness
| Birth Control Method | Typical Use Pregnancy Rate | Perfect Use Pregnancy Rate |
|---|---|---|
| Combination Birth Control Pill | 9% | 0.3% |
| IUD (Hormonal) | 0.2% | 0.2% |
| IUD (Copper) | 0.8% | 0.6% |
| Implant | 0.05% | 0.05% |
| Male Condoms | 13% | 2% |
Note: Rates may vary slightly depending on the source.
Factors Affecting Birth Control Effectiveness:
- Type of Birth Control: Some methods are inherently more effective than others. For example, long-acting reversible contraceptives (LARCs) like IUDs and implants are among the most effective.
- Consistent and Correct Use: Many methods, such as the pill, patch, and ring, require consistent and correct use to be highly effective. Missing pills, not replacing the patch on time, or incorrect placement can all increase the risk of pregnancy.
- User Error: Human error is a significant factor in the "typical use" failure rates. This includes forgetting to take the pill, using condoms incorrectly, or not seeking emergency contraception when needed.
- Drug Interactions: Certain medications can interfere with the effectiveness of hormonal birth control. It's important to discuss all medications and supplements with a healthcare provider.
What to Do if You Miss a Pill (Example using the Combination Pill):
- Take it as soon as you remember: If you miss one active pill, take it as soon as you remember, even if it means taking two pills in one day.
- Continue taking your pills as usual: After taking the missed pill, continue taking the remaining pills in your pack at your usual time.
- Emergency Contraception: if you've missed multiple pills or missed the pill for more than 24 hours, consult your pharmacist or doctor if you should use emergency contraception.
- Use backup contraception: Use a backup method like condoms for the next seven days.
Understanding the 9% Chance with the Pill
The reference states that with the typical use of the combination birth control pill, there is a 9% chance of pregnancy. This means that out of 100 women using the pill for a year, about 9 may become pregnant. This is due to factors like forgetting to take the pill at the same time every day, not starting a new pack on time, or other errors in usage.
