Well, like all potential teen mothers, you have three options.
First, abortion. If you are three months or less, you can have an abortion in most states. You will probably need counselling for that, though. It's not easy. Make sure that you are absolutely certain that abortion is what's right for you, if you are considering it.
Second, adoption. This is, obviously, the act of carrying the baby, giving birth, and then giving the baby up. This is also hard. But if you are pro-life but also not ready to be a mother at sixteen, adotpiuon will probably be for you. Open adoption means that you can have an open relationship with the adoptive parents you choose, and also potentially have ancontact with your baby after adoption.
Third, you can become a teen mother. This is, like the others, hard. But I get the idea that that isn't what you're considering? You seem to be keen on college and just being a kid, so I suggest you weigh your options.
Either way, you must tell your mom. Asap. There's nothing more important than that first thing. Next, you have to get an appointment with an ob/gyn.
Good luck, honey.
Tayzh