I'd try and get another early scan hun.
I had a MC last year at 8 weeks and it started with brown spotting then went to bright red blood. I got period like pains begin to happen (not as severe as my normal period pains though) and then I lost the sac which was devastating even at such a short time into the pregnancy.
However, this last pregnancy, I had some brown spotting again around 5 weeks and immediately thought I was losing the baby again. I had a scan at the EPU at 5 weeks and they saw the sac and again at 7 weeks when we saw the heartbeat (as you have done). It was such a relief. I'd had a little brown spotting up until the 7th week so was very nervous about the second scan but I now have a bouncing 3 month old
It's best to try and get it checked out. I hope it all is good news for you but do keep us posted won't you
