Is this a positive pregnancy test or an Evap line?

sarah
I took a First Response Pregnacy test and this is my result. It is a super faint line! Please let me know what you think based on your experience!
I am 4 days late for AF and I have been having cramps.  
I took a blue response and got a negative, a dollar tree brand and got a negative and I got another FAINT line on a first response test this morning. 
Does this faint line look like an Evap line??