If you miss a couple days, then just stop
taking the rest of the pack, that means
you're having unprotected sex. So yes, it
is extremely likely that you would get
pregnant at some point. That's where
babies come from after all!

So
if you do not want to get pregnant, you
have to actually use birth control or not
have sex.
Like Cari said, if you miss two, there is
no reason to stop taking the rest. Just
take them when you do remember and use a
backup method for a week. If you tend to
forget a lot, you could try setting an
alarm, using condoms, the patch, or Nuva
Ring, instead.