Unless you are emancipated, you are required to abide by your parent's rules and remain in their care and custody until you turn 18. The law doesn't make an exception for pregnancy, only marriage (which would require parental consent). In order to file for emancipation, you must be self-supportive (which means gainfully employed) and show proof of that to the court.
Your mother does not have any custody rights over your child, unless she petitions the court after the child is born and is awarded same.
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