How does one cope?

When does all the pain and emotions stop? I miscarried and I just can’t get it together. I can’t be happy for the ones I should be happy for. I have a sister that is due a month before I should have been. I have a niece who just gave birth the 11th. And the pictures made me cry so hard. Happy yet so very, very sad! And I want so badly to be pregnant and be a mother. And I just feel as if it’s never going to happen and it’s so hard to be happy for my family. I’m lucky if that’s the right word that my niece is states away and I had the opportunity to be there for the birth and I couldn’t do it, but my sister is minutes away and when it comes time if I’m not pregnant i don’t know how I’m gonna handle it. Not sure how I’m gonna handle a baby shower that I’m sure I will be asked to help with and go to. How do you cope? Any advice? I just pray and hope that I will be pregnant again very soon especially before my sister is due in May.