My heart goes out to everyone on here 
@BluebellTheDonkey puts it so well, I've definitely found the type of pain has changed, the shock fades along with the stark memory of the physical pain and the ache has remained and possibly always will, but it's not every day, not every week, my anger and frustration has faded.
What people who haven't experienced it don't always get is the loss of so much more than the pregnancy - it's the hopes and dreams from the moment you know you're pregnant, the "I'm going to be a mum" feeling, your partner's happiness at the news, the plans and the expectations. If you got as far as hospital appointments it's going from "mum and dad to be" to sad lady who lost her baby and husband who wishes there was something he could do to help but there isn't.
I'm still in the bit where because of my losses I don't know if I'll ever get to be a Mum but my friends who've had a mc that was followed by a take a home baby have all said it got better when they had their child, though they haven't forgotten the loss. Which I realise doesn't help at all OP if you don't know when you'll be able to TTC again. I'm so so sorry for what you've been through. I don't find it hugely helpful either tbh but it is true that having had one loss doesn't mean you're likely to have another, and most people who have a mc go on to have a healthy pregnancy and a baby down the line.
I don't ever find myself crying over other people's babies. I don't know why but I don't really associate them with my loss (apart from one incredibly annoying woman at work who had the same due date as me for one of mine and made a massive deal of how unexpected it all was and how shit being pregnant was, and yes, she knew about two of my mcs!).
It's true that someone else's luck or fertility or baby don't mean your chance of having the same are diminished. The world doesn't have a finite number of babies to go around and someone else having one doesn't mean you won't. But we feel how we feel and you have to protect yourself from what hurts you at the moment. Avoid the newborns if you can!
Do you think your pain about your mc might also be tied up with the end of your relationship? If so then it's even more complicated and tough to get over. Please look after yourself.