Prepairing to tell my mom im pregnant

Inami • kendal 9-11-2018 💙👶🏻 Clover-sol 6-7-2023

So im thinking of telling my mom around Christmas that im having another baby Im very nervous because the last time i told her she said im too young( i was 21, now 25) and missed a year of my son’s life. Now hes four and she’s obsessed with him. What should i do if she reacts badly