Please help

So I just recently had a missed miscarriage on April 3rd, since then had a period and ovulated. I tested 2 days ago and got a very very faint line, tested this morning again and the line is even lighter the 2 days ago.

Shouldn’t the line be getting darker ?

We’re I live it’s very hot, so I’ve been drinking a lot of water, just yesterday I drank 3 lt.

My af is due tomorrow.

I am so worried.

Could the faint be because of all the water or is this another mc :(

Please help.