I am hoping someone can help me. I am going out of my mind with worry.

I am 4w 6d today, and did three positive tests over the last week, the last one on Wed and it was a very dark line. Anyway, I just did one this morning and the line (on the same type of test from the same packet) is really faint.

I am terrified I am losing this one.

Is it possible that all is ok? I am thinking this must mean falling HCG.

Please help!!