Tara,
I am sorry for the dramas you are having..
Subchorionic haematoma is a collection of blood under the placenta- or where the placenta is developing. This can increase the risk of miscarriage depending on the size of the haematoma. However, it doesn't make miscarriage inevitable.
YOu are right to stay positive and hopeful - give your little one the best chance by focusing on healthy growing!

Thinking of you :hugs: