Low heart rate at 6w5d

I don’t know what I’m looking for in posting this but just feeling very alone. We had our viability scan yesterday at nearly 7 weeks and heart rate is 100. I was told there’s over a 60% chance of miscarriage and even if the baby lives a very high chance of chromosomal abnormalities.

I’m conscious this could turn into a late poss for me and I just turned 37. I’m scared I’ll never be able to give my daughter a sibling.

Going back for a follow up scan next Tuesday. I’m not looking for hopeful stories, but has anybody been through this before?