tests getting lighter?

Has anyone tested with a faint positive that got lighter/stayed the same color (not getting any darker I mean) and wound up with a viable pregnancy? I lost a baby in between my two boys and I had a faint positive that got lighter until my period came days later. I'm worried that same thing is happening.   I have very little symptoms besides being moody as all get out and crying at EVERYTHING (which is always my number one pregnancy symptom. I just cry.  All the time.)   I usually never worry about miscarrying but this time it's freaking me out. And I know the stress isn't a great idea for baby so can anyone give me some comfort here? ❤