Hey keepon 
Chat/splurge away! Always nice to see you. I'm so very sorry for your friend. You never know, my Mum's been babysitting for her neighbour's little girl as she's had loads of pain and bleeding at 12ish weeks and been in and out having scans and fearing the worst but has been told everything's all well in there now.
Can totally see why it's unsettled you. I remember howling when someone on my first pregnancy thread here lost her baby and I'd never even met her. When you're pregnant you can feel very invested in other people's pregnancies and it's almost a shared loss when it goes wrong. Can't even imagine it when you've also been through IVF to get there.
Remember to protect yourself as well, you have plenty on your own plate and your own concerns and she'll hopefully have other people to lean on if you find it too tough.
Your anxiety isn't irrational at all. After all you've been through of course it makes you nervy! But you've had a good scan and I feel so hopeful for you, please let us know how it goes on Tuesday. Everything crossed for you and mini keepon!
Will be thinking of you tomorrow unicorns. Due dates can be so tough 
I found my one from my MMC to be less difficult than I'd expected. The grief comes and goes irrespective of dates but I'd really worried it would all come crashing down on the day I might have brought our baby into the world so I arranged to work from home and had my Mum over for lunch, but I was alright in the end, didn't mention it to her and felt it pass calmly.
However you feel is just that, be gentle with yourself love. Always here to chat.