help!

im 20 days late & my boyfriend(17) & i(16) had sex on the 15 of this month. i still havent started. I started my birth control last month on the 17. my mom said if im pregnant i cant keep my baby (meaning i have to do the unthinkable) & my boyfriend & i dont want that i mean do we have a say in this i know we are young but she had me at 16 & then my little brother at 17 then my other brother at 26. do my boyfriend & i have a say? what should we do? what should I do?