Positive tests, now negative?

Stay with me here ...

I tested positive for the first time on Friday 3/30 at 10dpo. From then until last weekend I’ve had positive tests (I’ve taken probably 7 in all). The last one I took was Monday night (3 days ago) and it was positive.

Today, I am 5wks + 1 day. I’ve had some very light spotting - not bright blood either, dark old blood. The nurse line said that could be totally normal and to keep monitoring it.

Tonight when I got home I took a test and it was negative. My urine was pretty diluted though, like not yellow at all, because I’ve been drinking water.

Would that be enough to cause my negative or is it likely that I’ve miscarried?

My plan is to rest again with FMU.

Any insight would be helpful!