Sommer, it is not extremely likely, but it IS possible.
I suggest you wait and see if your period is late, and if it doesn't arrive on time, then take a test. In the meantime, you will need to use a condom or barrier method if you have sex during the next seven days and continue taking your pill as normal.
If you ever forget again, then remember there is always emergency contraception in the form of the emergency "morning after" pill and the IUD they for reasons like this, in case people forget.
Good luck and try not to worry too much just yet. It's also perfectly possible that you aren't pregnant.