well thats just great, your mom does not approve of the guy you are with but hey! lets have a child together to make everything better!
first off, you are a child. children should not raise children and yes you were very dumb to have planned this. have you thought this through? wait how stupid of me, no you clearly did not because of the fact that your asking what could your mom do.
do you know how much a child costs? how hard it is? how frustrating it can be? how much responsibility goes in to having a child? your boyfriend could leave you and do not say he wont, because he could. no 16yr old wants to play grown ups, they WILL say anything to get in your pants.
Your mom could kick you out of the house for going against her wishes of seeing this guy and now getting pregnant by him.
How are YOU and your boyfriend going to provide for a child which is a $40,000 expense, chores and allowances and part time jobs do not cut it. and seeing as you both have not graduated yet, and that you cannot work seeing as you are not of age, how are you both going to provide for a child and graduate from high school? a diploma is a very important document to have when finding and getting a successful job or career.
You better tell your mom about this now, she cannot have your boyfriend arrested or charged for rape because you would have to give a statment saying that,
however, your mother will most likely be the main care provider for this child you are about to have, seeing as she is the only one who brings home an income.
so i would tell her now and listen to what she has to say.
no she will not be happy or plesant about this, and she has damn good reason not to be pleased either.
you really should think about putting this child up for adoption, because you have so much more to live out and experience in life.
you do not know how hard it is to raise a child.