How would you feel?

My boyfriend shared a post on Facebook of a newborn box frame. His very pregnant sister in law knows that we have been trying to conceive since she did. I'm upset about the comments for these reasons. 1- We've been trying to conceive since July 2017 with no luck. 2- She got pregnant the 1st time trying... I've been trying to let nature take it's course but all I think about is getting pregnant and having a baby.