Sister-in-law envy

I am struggling because my husband and I have been TTC for 2 months but been off the pill now for 6 months. My sister in law just let us know that she is 3 months pregnant win her 2nd child. Her first child is barely 1 year old.
My husband and I are always 2nd best to the brother and sister in law. Always. I don't want my baby to be compared to hers when we have kids. AND I am definitely sad that she is pregnant now wih the 2nd one when I am not even pregnant win my first. :/