Massive stress while pregnant - worried about miscarriage

TW: cancer, miscarriage

so stressed about stress! I had a missed miscarriage at 12 weeks in December last year and a massive haemorrhage while miscarrying - it was so traumatic, I still can’t believe it happened. Now I’m pregnant again and was lucky enough to see the beautiful heartbeat at 8 weeks! But my mum is dying of cancer atm and she has severe mental health difficulties so her care is impossible. I am so worried about having another missed miscarriage or the stress hurting the baby. I don’t know what to do.

Any advice really so welcome.