A woman ovulates 14 days before her next period begins. It doesn't sound like you're going to get pregnant if you had sex right when you got off your period, but it's not impossible.
Please, hon, use condoms in the future. Pulling out will not protect you from pregnancy. You might also want to consider getting on the pill. Contact your local .planned .parenthood - they'll be able to help you with birth control, and they won't tell your parents.
Good luck, hon.
Note: I've moved this post to the appropriate forum.