What should I do about abuse?

i was in a very similar situation my ex send me to the hospital.. i have asthma so i don't play around with my breathing or lungs.. i remember last time he "beat" almost killed me.. he was punching me fist closed in my face and stomach ((didn't know i was 6week pregnant)) and he was choking me against the wall and i fell unconscious ..i woke up in the hospital all bruised and hurt and the doctor told me i lost the baby.. i didn't even know about... and that's when i realized that i was SO stupid ... i didn't leave him since the first time he hit me!! i should of cuz i got worst... just go to police and file a report on him... you have to choose file charged against him and he wont get near you.. or let him file charges for you and maybe you wont be able to see your son ever again.... make your decision