@Hagster I'm so sorry you're having a tough time. A couple of suggestions from me (and feel free to tell me to nick off)
The people around you know, so should you have a bad scan result you will have support around you to help you through it.
While work has been stressful, we all have a degree of stress in our lives that is outside our control. Busy and full on doesn't mean bad. And (not to minimise your stress levels) women in war zones manage to have perfectly healthy pregnancies.
On the movement front, lots of people don't feel or recognise movement until as late as 24 weeks. You may have an anterior placenta, or the bean could just like to face your back, so your less likely to feel/notice those movements.
Bump size has absolutely no impact on the health of your pregnancy. I know someone who didn't know they were pregnant until the went into labor. She was a size 6 and did not change at all. She had a healthy 6+lb daughter.
On the detachment front, honestly by this point you'd have to be a robot to stay detached. Regardless of the outcome you are growing a very much loved and wanted child. I know it seems easier to ignore it, but I honestly think that denying our emotions makes things worse, because all the hormones flying around are driving us to want to care for the child we're growing.
It's difficult and it's scary this whole pregnancy after loss business. I genuinely feel privileged to have met such a wonderful supportive group of women here. Please don't ever feel bad for getting things off your chest, it's why we're all here and hopefully we can help make things am little bit easier and brighter for each other. Please be kind to yourself and take care xx