Extremely scared that I’m pregnant at 9 months pp

I think I’m pregnant. I’m a week late gonna test tomorrow. Please help me feel less scared. I feel guilt , stress , excitement , sad. Idk how to feel. I would love another baby and we always planned to have another eventually. This seems so soon though. I feel like imtaking away from my baby that I already have & that I’m gonna be so tired being pregnant and it’s gonna be so much harder. I’m terrified. Every possibility of how hard it’s going to be is going through my mind. Also . Have any of you given birth 18 months apart ? I’m also nervous how my family will react( I know it doesn’t matter but still nervous about it ) since she just turned 9 months and we’re only 23