Medically reviewed by Alan Lucks | MD, Alan Lucks MDPC Private Practice - New York on February 20th, 2026.
Plan B does not cause long-term fertility issues
Emergency contraception temporarily alters hormone levels
Multiple uses do not impact future pregnancy potential
Consulting a healthcare provider is recommended for ongoing contraception needs
Emergency contraceptive pills like Plan B have become an important option for women seeking to prevent unintended pregnancy. Many women worry about the potential long-term impacts of using emergency contraception multiple times. Understanding how soon after unprotected sex you can take Plan B and its effects is crucial for making informed reproductive health decisions.
Plan B contains levonorgestrel, a synthetic hormone that prevents pregnancy by delaying or stopping ovulation. When taken within 72 hours of unprotected intercourse, it can significantly reduce the risk of pregnancy. Unlike some misconceptions, research on birth control during pregnancy and emergency contraception shows no evidence of long-term fertility damage.
When taken, Plan B works by:
Preventing or delaying ovulation
Thickening cervical mucus to block sperm
Potentially preventing egg implantation
Medical research consistently demonstrates that frequent use of Plan B does not impact a woman's ability to conceive. Reliable online gynecologists confirm that the medication provides a temporary hormonal intervention without causing permanent reproductive changes.
Side Effect |
Duration |
Typical Experience |
|---|---|---|
Irregular Bleeding |
1-2 Months |
Temporary cycle changes |
Nausea |
24-48 Hours |
Mild to moderate |
Breast Tenderness |
1-2 Weeks |
Variable intensity |
Menstrual Cycle Shift |
1-2 Months |
Timing may vary |
While Plan B is safe, frequent use suggests a need to explore more consistent contraception methods. Gynecological care providers recommend discussing long-term birth control options that offer more reliable pregnancy prevention.
No, medical research shows no long-term fertility risks with repeated use.
Most effective when taken within 72 hours of unprotected intercourse.
No, it's designed for emergency use and is less effective than consistent contraception.
Generally available over-the-counter for individuals of all ages.
No, it only prevents pregnancy and does not protect against sexually transmitted infections.
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Emergency contraceptive pills like Plan B have become an important option for women seeking to prevent unintended pregnancy. Many women worry about the potential long-term [...]
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