Have you got a GP that can send you to a private u/s clinic? It might be the way to ease your mind.

I had spotting throughout my pg (after m/c the first too) and I got a doppler and it saved my sanity. I know all the bad things and risks with dopplers, but we limited our use and I was always able to check after a bleed that all was okay. It might be the only way to keep your mind at ease down the track.