My sister in law just announced she is due same day as me

We are both 12 w 3 d and she just announced to family today, we announced awhile back. This will my first but her third. I feel terrible for even feeling annoyed. My mother in law will likely go to be with her now around that time because they will need somebody to watch the kids while in the hospital. I know it's silly, I just feel it takes something away from my pregnancy. :(