Hi FutureNanny. I'm so sorry for your loss. It's a really horrible time, and I also found it very hard to see how to go on. I miscarried at the start of July at 12 weeks. It does get easier, although some weeks are just very hard, and I've found that other emotional changes in my life have brought the pain back later on. I work one day a week and took two weeks off from that, and a lot of other MNs advised to really take it easy getting back to work. If you work with young children I think that's going to be especially important and I hope your work is understanding.
I also felt like I'd failed at some level. With me the foetus didn't develop at all, so I felt like a fraud for saying I was pg for 12 weeks, when there was no one growing in there in the end. But that also passes I think. It's not your fault, it's just pure biology, and I found it helpful to think that actually the mc was my body doing its job - the pregnancy was never going to have worked, and my body eventually recognised that and got rid of it all so we could try again for one that did.
I have a DD, and I found that, actually, spending time with her and planning stuff to do as a family that would have been more difficult if I'd been pg helped me a lot. We went on a little camping weekend, and have just planned lots of outings etc. I'm sorry your DS reminds you of what's happened, but I hope that passes. I think that the first few days and weeks are enormously upsetting, and your hormones will still be all over the place, which contributes to that. It is a grieving process, and it just takes time and support from people close to you to ease a bit.
Like you, I also felt like my pregnancy was perfectly timed, due day after my birthday, DD would be settled in preschool but still around to see the baby etc. But there are always happy and not so happy coincidences with this stuff, and you just can't plan it.
Do what you need to now, looking after yourself and your family is the only priority. I still find small babies and pg women difficult and I've basically cut off anyone who's pg or has a little baby and isn't a good friend, out of self-preservation really. I hope I'll be pg again one day, and in the meantime I'm trying to just focus on one day at a time, relaxing and not getting caught up in planning months or years ahead. I know it's very early for you, and it is such a shock and so hard to think how you can get through it, but it will get better. Take care of yourself and make sure others do as well.