HELP: Telling my family I’m pregnant

Can I get some advice/words of encouragement for telling my family Im 17 and I had an abortion almost 2 years ago I let my mom choose that for me because she completely scared me out of any other decision saying she’d completely abandon me and she said my grandma would do the same. But now I’m in a different spot in life i moved out and don’t depend on them for money I’ll be 18 when the baby’s born and I’m in a serious relationship with someone who supports and loves me I’m just so scared to tell them because of the way they reacted I’m gonna tell my grandma first to maybe help me out more. Please any advice on how to do this???