Just had my dating scan (which will have to be repeated anyway as I'm only 6+5) and the sonograpehr found a subchorionic haematoma
. She told me it was nothing to worry about but, of course, I couldn't help myself and immediately googled when I got home.
The baby's heartbeat was strong and clear but the haematoma looked pretty big to my untrained eyes. 

I have had no bleeding but do get cramps and a bit of backache occasionally.
Please come and reassure me.