aNgel, I'm so sorry you have to go through this The spotting could be nothing, as long as it's not full flow, it should still be fine. As for OB not seeing anything, that is also a possibility, they don't have the strongest equipment in their offices and sometimes you need to go to the imaging place where they have the high tech devices. So don't give up hope yet. You should know more at the scan tomorrow. I don't think your HCG numbers are relevant at this point, it's really all about the scan.
When i was utd in february, my HCG was rocket high and yet I had a blighted ovum which they only saw at the 7wk scan.
I wish you the best of luck and I hope you have a fighter in there
PM me if you want to talk.