What do you mean you started your normal
period on the 13th? Was that during the
placebo week? Was the 30th the placebo
week? Are you on the placebo week now? The
placebo week is when your "period" is
supposed to happen.
As far as your body is concerned, once you
had taken birth control for one full week,
you were not "behind". Whenever the
placebo week comes along, take them for
seven days and then start a new pack, no
matter what day of the week it is, or even
if you're still bleeding.
Bleeding, especially if it's heavy like a
normal period, means YOU ARE NOT PREGNANT.
Where in the world would the embryo be!?
You're bleeding it's whole world out
through your vagina
That said, the only way you would be
pregnant is if you had unprotected sex the
week before you started, the first two
days you started, the two days you missed,
or 7 days after you started taking them
again. Why? You need to take birth control
pills correctly for one full week to be
protected.