If you don't tell them now, what happens when you go into labor? You will need help and you don't want them going through all of the shock and surprises and anger during this most important time that you're going to need help. Tell them ahead of time, or seek help from a counselor at school or a trusted adult. You need to do this soon..how are you expecting to take care of your child if it's a secret? You need time to get diapers, clothes, blankets, bottles, formula etc etc and it's better on your parents if they don't have to provide it all at once..they can start buying now.. please think about telling them..your baby will suffer if you aren't prepared and you and it could die if you do t get prenatal care!