Am I?

Am I a horrible person for hating that my sisters pregnant? She’s already got 3 kids and she doesn’t even have her own kids living with her but she’s having another baby and she hasn’t even told me about it? My other sister had to be the one to tell me I don’t think it’s the fact she’s having a baby it’s more that I can’t and that she hasn’t even got her own kids but is conceiving another?