hi,
the emergency
contraceptive pills can protect from
pregnancy as she has taken within 4 hours of intercourse,
they are having side effects like menstrual irregularities, they can prepone and postpone the periods depending on the time when they have taken,
so as she took tablet in first half of the cycle they preponed her periods,
so you need not worry she will get periods in next month,
if she doesn't get periods within one 16th july, you once check for pregnancy as the tablets are having 1% failure rate.
as frequent taking of pills can affect menstrual cycles,
so better to shift to regular method of
contraception.
take care