Could this be a pending miscarriage!?

I tested Monday got my first bfb since then I've tested and seems like my pregnancy test lines keep getting more and more Faint I don't have any pregnancy symptoms at all even when I had the strong pregnancy lines I still didn't have symptoms I went to the dr Tuesday and got a positive according Too my lmp I was 6 weeks and 6 days but since then I've tested only to get faint lines I took a clear blue test as well the lines were stronger but I'm still freaking out because I hear the blue dye test aren't as reliable I don't have my first ultra sound until Monday and I'm getting so worried