I don't know what you mean about your cervix being small, unless you had it checked by your doctor. The cervix is the opening to the uterus and is too far inward for you to see or feel.
You should take a pregnancy test and try not to be so afraid. Relax. A positive result is not the end of the world or your life, even tho it may seem to be. If you are pregnant, you should speak to your parents and/or a doctor right away so that you can consider what options you have, and will not be alone with this new thing that has happened.
Pregnancy is a normal result of having sex. Our bodies were made for that, and there is nothing to be afraid of. If you are not pregnant or do not want to get pregnant again, consider the option of staying sex free.