someone convince me to stop

Tell me to stop testing. I'm 7w1d by my lmp but I know I'm not as far along by a couple days. I've probably taken 25 tests and started experimenting by diluting urine with water to see if I could still get a positive. I mixed 500 parts water to 1 part urine and got a positive two days ago and today the same thing but it was more faint. So now I'm getting worried. I even got to where I could mix 1000 parts water to 1 part urine and still got a positive. 
I think the tests themselves are probably crap, they are accumed from Amazon. 25 tests were $7. But after 2 miscarriages and a chemical I can't help but be concerned. 
My symptoms don't seem to be as bad as some others either. I have an almost constant heartburn and occasional indigestion. I get nauseous maybe once a day and no vomiting so far. My boobs are bigger but not tender and I have terrible gas and gas pains.