She took a plan b pill while she is on the pill and we know it will mess up her system but how long will it last.
It could be weeks. She may bleed during that time, it could be light or v heavy. She may experience lots of hormonal symptoms, such as back ache & cramps etc. & her next scheduled period could be late by a couple of weeks or so.
There's no way of knowing if Plan B has worked, until her next period is due & you do a pregnancy test, or that period comes along.
Anything that happens prior to when her next period is due, is bleeding from the plan B. On the other hand, some women don't bleed at all. It depends where she is in her cycle.
- Plan B Information for Consumers
- Plan B Information for Healthcare Professionals (includes dosage details)
- Side Effects of Plan B (detailed)
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