Agreed with shilo and pilot, try not to worry. You do have a reason for bleeding, and bleeding alone isn't necessarily bad, especially if you already have a diagnosed SCH. Take it easy and rest as much as possible today. I'm sure those heartbeats will still be there when you go for your appointment on friday and hopefully the bleeding means that the SCH will be smaller or gone!
I'm having a duvet day with my daughter today, snuggled up on the couch and watching my neighbour totoro. And because pregnancy food aversions are a bitch the only food I can keep down is technically forbidden...toast with pâté. I think it's just because of vit A though, and you'd need to eat a lot of it to reach dangerous levels, so I'm allowing myself a thin smear.