has the spotting eased at all? I remember with my first pg, I had spotting at about 5 weeks and didn't have any other signs of a m/c, no cramping or anything and my pg symptoms were still strong (nausea, sore boobs, extreme fatigue etc) so when I had a scan at 6 weeks, there was a healthy little heart beating away. Please have confidence that you are still pg - all those tests can't be wrong, and besides, maybe the tests your DR was a faulty one? especially if the window looked cloudy?