17 and pregnant

Hi guys, im 17 and pregnant. (Not on purpose) I graduated last year, have my own apartment, yet my mother thinks she can pick my babys name and be in the delivery room. I've tried to tell her no and his name will be what i want it to be (which is my grandfathers middle name) whether she likes it or not but man she throws fits worse than a toddler, anything I can do?