Just some friendly advice:
Even on the pill, there is still a risk for pregnancy. Take it from someone who took the pill correctly and still is the mother of a 1 and 1/2 year old baby girl.
If you think you might be pregnant, the only way to know for sure is to take a pregnancy test.
I would wait a few days, just to make sure your period isn't just late.
Even on the pill, you should always, always, ALWAYS use condoms. The pill doesn't protect you against STD's.
Oh, and if you forget a pill one day, it is perfectly fine to double up and take 2 the next day.
You should try to take your pill during a daily routine, that way it will become apart of your routine and you will be less likely to forget.
Or set your cell phone alarm to go off the same time every day.