It’s been almost a week?
If your periods are regular, then you did not need emergency contraception on the day you were due to start your period, as you would be well out of your fertile window.
Plan B can commonly cause hormonal side effects, such as those you'd get with a period or pregnancy, for example. A late period is common.
If you're sure you weren't already pregnant, then it's just a case of waiting for your body to recover from the huge dose of artificial hormone in Plan B.
However, if your periods are irregular, then I'd suggest a pregnancy test. I'd repeat it in a couple of weeks if you still haven't started your period.
- Plan B Information for Consumers
- Plan B Information for Healthcare Professionals (includes dosage details)
- Side Effects of Plan B (detailed)
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