It sounds like you have a subchorionic hematoma. There are plenty of success stories from it, and since yours was diagnosed early, it's likely to reabsorb by 20 weeks. I had loads of bleeding at 6 weeks when mine was diagnosed, but it tapered off and I only had spotting up until 8 weeks. I'm now 12 weeks and haven't had bleeding or spotting for 4 weeks, so I really think mine has reabsorbed.
They should have told you to go on pelvic rest (no sex, orgasms, or heavy lifting that strains your abdominal region) until it clears up It's pretty lame that they didn't even give you the proper name for it! Also, drink lots of water, rest, and try not to overexert yourself.
There's a subchorionic hematoma thread on bnb with lots of positive stories and also a few support groups on facebook.