[ertyuio]

As LittleMiss said above, pulling out is not a reliable form of birth control. And, you can get pregnant at any time, regardless of your ovulation cycle. I honestly don't think you should be having sex while knowing so little about it, it's very worrysome.

If you feel guilty about using contraception, you're going to feel even more guilty when you get pregnant and it forces your boyfriend to become a father before he leaves high school. It will cause him to be resentful. Would you rather sin (which you are already doing, by default) by using protection, or be impregnated by someone who is far from being ready for a family?