If you want an abortion then I guess so, but tell them soon as you can because right now you are only 4-5 weeks and babies can feel pain at 10 weeks. If you don't want an abortion and your parents are understanding enough they will probably let you have him/her, but given the fact that you are 13 they will probably act like the baby is theirs and crap, but lucky they were planning for one so it's not like they don't have money. Just make up your mind on if you want to have the baby fast, then go with either of the choices. Hope it goes well for you.