sister-in-law pregnant . warning I'm going to vent

I just found out my sister-in-law is pregnant.
I know I should be really excited for her but I can't help but fake it. It seems like everyone around is getting pregnant. My husband and I have been married and TTC for three years. We've had three miscarriages (I also had a previous miscarriage when I was 16). 
She has been married for only a couple months, been with him less than a year and now she is pregnant. I know I should be happy for her, I am I think. That's sad to say and I hate it but  I'm hurt,  I feel like a failure. 
Does it ever get easier? 
Sorry for the vent, this is something I can't talk about with family