@anotherypasswordtoremember I am so sorry to hear about your loss. I have sadly experienced this in both my previous pregnancies, DFIL with my first and my DM with my second, so I know exactly how you feel.
Firstly try not to worry about the stress on the baby, bodies and babies are very resilient in these times but of course if you feel yourself getting panicked or out of control then deep breathing, yoga, a walk. Anything that will help that. Be kind on yourself and don't feel bad for feeling angry this has happened during this time. It's a really hard thing to handle at the best of times let alone when pregnant.
Secondly when DFIL died DH took it very hard, he wasn't really present emotionally which I found hard to understand (until I lost I parent). I would try give him some space and lean on your friends and family to help.
Thirdly, when is your scan? If a while off maybe book a private one to help reassure you, you don't need that eating away at you.
I've had lots of cramps and back ache too. No bleeding though so just have to assume all is well until I find out otherwise.
Sending you a hug and always here for you to talk to x