Everyone has their own definition of what "wrong" really is, so no one can tell you for sure if being a teen mother is right or wrong. Having a baby at your age is a lot of things, some negative and some positive (i guess), but there's no black or white - it's a million shades of grey.
What are your plans for the future? Are you planning on going to college? Do you live in your own home or do you reside with your parents? How is the father involved in this (if at all)? Can you afford this child? Can your mother afford this child (in the event you cannot)?
I strongly suggest you look at your current life situation based on the questions I asked and then examine each of your options, of which you have three. I
cannot and
am not suggesting you take one particular course, because what is right for me or for someone else may not be right for you.
Before any of you dive down my throat about this, I am not trying to talk this girl out of any decision - I am giving her some non-sugar-coated advice. Sweetheart18, if you are not aware of the amount of work, time, money, and patience childcare requires, I advise you to familiarize yourself with the concepts if you choose to keep your child. Remember, children need more than love to have a good life - love won't buy food and diapers, among other necessities.
Parenthood is no walk in the park, and it will impact your life enormously and permenantly. Baby-sit some infants and toddlers - do more than read the parenting books. F you haven't done so already, get some first-hand experience with kids so you'll know what to expect. I know everyone glorifies parenthood like it's the answer to the world's problems, but it won't be easy. Children might be blessings to some people, but they are so only if you are willing to put forth the tremendous effort to raise them.
Also, be prepared for some disappointment, frustration, and anger from your mother. There is no easy way to tell her, and this is something I cannot give insight on because i've never had to do it. Your mother may feel upset because you chose not to tell her right away. I assume you are waiting until you're a legal adult to tell her so she cannot try and put your child up for adoption (which, from what I know, can be done in some places with minor mothers) or try to dictate your decision otherwise. In any case, brace for the impact. This is all assuming, of course, you still live with her - if you have your own home, she may not be as affected by the situation.
If someone wants to get on my case about anything i've said, please be mature about it and take it to a private message (which is conveniently located in everyone's profiles). I do not want some petty, meaningless argument impeding sweetheart18's ability to get the answers she seeks.