Feeling sorry

I had a miscarriage last January and my fiancé and I have been trying ever since with no such luck. I was doing well but then end of July/early august is when I was due to deliver. I struggled at that time but I got through it again. And I have been well and in a good mindset for weeks when today my ex husband drops the bomb on me that his ex gf is pregnant. He’s moving an hour and a half away from my children to be part of his new child’s life. So that in itself is upsetting. But I feel like a terrible parent because that’s not even the part that’s most upsetting. It’s most upsetting that everyone around me is turning up pregnant, even those who do not wish to be. Yet I have struggled to get pregnant. I know everyone will say your time will come. You already have children. It can take a healthy couple up to a year. I know all of these things. But in the past year one thing after another has piled up on me. I guess I’m just feeling sorry for myself. I just don’t want to feel this way anymore.