I don’t know how to tell my sister I’m pregnant

So my older sister and i have girls that are the same age and since we had our kids she’s been telling me we should never have kids again and we should focus on our future and do something with our lives . Now I’m pregnant again and it was by accident and i’m 11 weeks and still didn’t tell my sister because i don’t know how to tell her i don’t want her to get upset with me 😣