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: This can be a warning sign of an ectopic pregnancy (a pregnancy outside the uterus), which is a medical emergency.

Most people do not need to contact a professional after use. However, you should "report" your symptoms to a doctor or seek immediate medical attention if you experience: Plan B

, you can report it through the following official channels: : This can be a warning sign of

: If you throw up within two hours of taking the pill, it may not have been absorbed, and you should contact a professional to see if you need another dose. it may not have been absorbed

: You can report serious adverse reactions to the FDA MedWatch Program online or by calling 1-800-FDA-1088. 2. When to Contact a Healthcare Provider