To be honest - I wouldn't worry about it too much. You knew it was there and the lady said that it wasn't on the placenta and there was no blood flow to it (so it isn't still freshly bleeding).

Check it with your Obs when you have your next appointment - but they will have been faxed a copy of the report as well (well mine always is - I assume that this is standard practice) and will ring you if any alarm bells go off.