Decreasing HCG?

Lauren • Baby boy Nate born 10-07-17
Has anyone experienced decreasing HCG at 6 1/2 weeks? I'm 6 weeks 4 days today and no bleeding at all, but my symptoms are going away. I was super nauseous all weekend and then this morning I feel totally fine so I decided to take a test and the line is there for sure, but not dark. Does this mean I may be miscarrying? Kind of freaking out over here.