Did you end up taking the missed pills on the day you finally realized you missed them? (you know, you're supposed to take 2 pills in one day if you missed the day before idea)
there's a chance you could have gotten pregnant if you ovulated (10-14 days from the first day of your last period). You might not want to take a pregnancy test yet. Wait til you miss your period (i'd wait a few days after your period is supposed to begin before making assumptions). A doc friend of mine told me there are 2 types of birth control pills an older and a newer one. The older being ones like ortho tri-cyclen type (3 hormones in one pack) and a mono type (one hormone throughout the pack). He says if you are on the ones like ortho tri cyclen and take a pregnancy test, you'll get a positive reading because the hormones in this one causes you to generate pregnancy hormones to plug up your cervix with mucus.
If you do eventually miss you period. I'd go to a doc and see what they say. They'll want to check your blood for hcg levels. They can also do an early ultrasound to verify pregnancy (all they'll look for is a gestational sac several millimeters in diameter).