6 weeks 2 days bleeding

Tuesday I started spotting brown at exactly 6 weeks, Wednesday had minimal brown spotting. Now today at 6 weeks 2 days I have red light spotting, not enough to fill a pad, just when I wipe. Very little clotting, but have had mild back ache and cramps. But I have been cramping lightly through this pregnancy. I called my doctor and now have an early ultrasound scheduled for next Wednesday. Anyone else had this and been okay? I misscarried a few months ago already, and the bleeding isn't as dark and heavy as that time. Thanks in advance