I'm sorry you're dealing with the worry and stress.
For me, sadly - I always deal with some kind of bleeding and/or spotting during early pregnancy. Sometimes it means something is wrong, other times they can find no reason for it.
My Dr always told me that "old" (brown) blood wasn't a worry, because sometimes you can shed some of the lining of your ute while you are in the early stages of pregnancy.
Hopefully it's nothing to worry about and you'll have a great scan and see your little one growing strong