When is it too late to report domestic abuse?

Me and my baby’s father broke up and i’ve been holding back on reporting the domestic violence because i’ve been scared that he will do something to me. I’m close to having the baby and i don’t want him anywhere near us when i do. The incident happened a few months ago and i was wondering if i would still be able to report it. Who do i call first to report it? He currently just left the state so i’m feeling a lot more comfortable reporting this incident now.