This might be selfish but...

So my husband and I started trying to get pregnant spring 2017. We were thrilled to get our bfp within the first three months. Only for it to come crashing down a month later when I miscarried. We spent the next 9 months ttc. During that time we both had a large emotional wall to get through as well as our marriage struggled due to it. But we finally got our bfp for our rainbow baby. The first trimester was rough, I had to be put on progesterone and around week 7 (which is where I MC first time) I was put on temporary bed rest due to spotting. Thankfully that was just caused by the progesterone. But after the first trimester things have been doing pretty great so far. We are due late Jan with a boy (first boy for both families). Well last night my sister announced she is pregnant with her second just 4 months after I am due. While I am thrilled to have another niece or nephew i am also rather upset. (Here comes the selfish part) my sister has always been the princess and my family has always catered to her and that only got worse when she got pregnant the first time (first grandbaby). So I am upset because my husband and I have gone through a lot this past year and a half and I had hoped to have my baby and me get some attention for once. But now it's gonna be my sister's show once again. And to make it worse when I expressed my feelings to my mother she defended my sister. I just know when her baby comes it will be all about it because my parents always do that even when they say they won't. And if she has a boy too then my kid will be back burner. Like I said I know this is selfish I guess I just want to be important too, just one time in my life.