Getting over miscarriage

How do you get over a miscarriage when their are over 50 expecting mothers on your Facebook? & you're not one of them anymore. & now my sister in law, & best friend are both pregnant too. It also makes me upset that they both even started trying so soon after my miscarriage. I know it's not all about me but it's only been a few months & I just don't know how they expect me to react :( I cannot deal with finding out another person close to me is pregnant. I'm happy for them, just not as much as I wish I was. I wish it was me too. I should be 20 weeks now :(