Here's what ob/gyns want you to know. It contains a hormone called levonorgestrel and is more effective within 72 hours of unprotected sex. If my girlfriend took plan b can i cum inside her without her getting pregnant It does not prevent pregnancy for any unprotected sex you have after taking it You don't, however, have to wait until the morning. The effectiveness of plan b decreases the longer you wait, so taking it sooner is better
After taking plan b, you may feel some side effects, including nausea, abdominal pain, headache, dizziness, or vomiting.
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