Easy at home pregnancy tests getting fainter?

[Rose38]

So I had a positive test (see attached) on Friday. Periods were due Sunday and still no sign of them. Since the weekend, the tests I do now come out with the faintest outline of a second line.
I have tried Clearblue (the one with the + for positive sign) but that came out negative.

I have been having weird pulling sensations and stomach pains these past few days. Boobs hurt so badly & look bigger and feel more heavy. The pain is to the point where it's keeping me awake..either that pain or the stomach pains. Doesn't feel like the waiting for periods kind of symptoms.

Has anyone else had this with Easy at Home tests? I know everyone will just say wait a few days and continue to test but I just wanted to see what other people's experiences were with them.

It sounds like it could be a chemical pregnancy. I hope not x

I had lines fade and fluctuate when I had an ectopic pregnancy. I also had the stomach pains and the pregnant symptoms (sore boobs, felt sick, sharp stabbing pains on side the ectopic was on)

To be honest it's impossible to say.
Ive had lines getting fainter.. that turned out to be a chemical pregnancy.
This time around I also had lines get fainter ..and I'm now 3 months

I can't even see any second line now even though I still have really painful boobs. My stomach hurts on and off (not period type pains). I'm starting to think maybe the initial tests I did may have been faulty. I'm now 4 days late for periods..still no bleeding of any kind.
Have done a boots pregnancy test this morning but it's not showing anything.

Would I need to go for a blood test if my periods still do not show up next week?