Does this mean what I think?

So I've been taking tests every morning since I got a BFP to check lines because I've had several chemicals. 
Yesterday I took two tests and they were very positive. 
But this morning when I tested, my frer looked lighter and EPT looked darker? Why was the frer so light? I noticed the line was a little off too. Or had this happened to anyone and it be completely fine? These are my tests from this morning? 
 Did I possibly have another chemical or miscarriage already? 

Vote below to see results!