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<http://www.netdoctor.co.uk/ask-the-expert/sexual-health/a11316/why-did-my-period-start-when-i-was-halfway-through-my-pill-packet/>
<http://www.netdoctor.co.uk/ask-the-expert/sexual-health/a11316/why-did-my-period-start-when-i-was-halfway-through-my-pill-packet/>