Depression after miscarriage

Hello everyone I need some advice.

About 8 weeks ago I had a miscarriage. Unplanned and we already have a two year old so at first I wasn’t devastated - I mean it was sad but I was more “What will be will be” kind of feeling.

But I’ve found I get more and more upset by it as time goes on. Three people close to me since have discovered they are pregnant and one friend has given birth. I am so happy for all of them but I think it has some correlation to the sadness I’m feeling.

I’m no stranger to depression, I’ve had it my whole life - but this is something my anti-depressants aren’t even touching.

What is this? Am I supposed to have another baby or is this normal, I can’t stop thinking about it. I get no sleep anymore because I can’t stop and I don’t know what to do.