I totally agree - a scan won't tell you anythign at this point. But a BT would give you a good diea if HCG is rising or not. My clinic wouldn't do a scan until HCG was over 1500, as they said we wouldn't even be able to rule out ectopic until we get to those sort of levels.
In some good news, I had my scan today & there's a bub in there! We saw a flickering heart, such a relief. I felt physically sick on the way there. Dr could see what looked like the source of bleeding, which was just a small blob near the sac, but not affecting it. Maybe a small fibroid or something else.