Is it wrong?

Cierra • Hey y`all I`m cierra, 21. We have a 3 year old daughter, Scarlett and another due april 24, 2015
Is it wrong if me to be slightly upset that my sister announced testerday that they are expecting? She isnt due until two months after my due date. But, i feel like the sootlight will now be off of our pregnancy and on to hers... She is my step sister anf her mom likes to push us aside when her kuds have news or something like this happening. They are supposed to come out for the delivery but now i have a feeling they will be using their time off for hers. I live 1200 miles away while she is around the corner