when you are ready!! talk to your school counselor about it maybe she can help you on how to tell your mom? she will he mad at first ! but mom's eventually soften up to the idea. best of luck!! I was scared when I told my mom but she asked me what I wanted to do so hopefully your mom can be encouraging
I'd say tell your mom as soon as you can. tell her that you are terrified and that you would really appreciate her help and opinions (even of that's isn't 100% true). just tell her you are sorry to disappoint her but you can't change the past and can only work on the future. tell her you will get a job to take care of your baby (that is if you want to keep the baby, If not then tell her you want her to help you pick the parents). just make her feel involved and important and hopefully that will make it go over smoother