Positive then a negative ??? Advice?

So last night I posted my faint blue line on my test, and all of you said it was a positive and it really had me goin. Like it wasn’t discolored it was BLUE and it was a THICK line. So I ruled out Evap. I also have read that if you take apart the test and wipe water on the line that if it is in fact a EVAP line the water will wash it away and that a positive will stay strong. And I did that, and the thick blue line did not fade or go away. But this mornin I took two more tests with first morning urine, and they both came back negative. Yet I still don’t have a period 6-7 days late now, and I still have the cramping and milky CM. Nips are sensitive and a little darker then normal. And I’ve been constipated just slightly the last few days. I’m unsure where to go now. Maybe wait a few more days and test again. Any advice for me?