Positive or Evap Line? Help please!

So I know I am testing way too early, I start my period in 8 days, but I had a pack of three of the same tests. I took one last month and it was negative but hours later the evap line showed up as a very thin but bright blue line, I got my period on time and knew it was negative.. and yesterday I took a test and it came back negative then hours later the same evap line popped up like last month. Then I took one this morning and it seemed like a negative but then about an hour later a faint blue line showed up, it’s been a whole day now and it still looks the same and has not gotten that thin blue line like my other tests.. could this be a faint positive? Or does this evap line just look different than the other two?