pregnant again!?

Kim.
I have a 4 1/2 month old and just felt I needed to take a test because something was telling me to, and i can't tell if there's a very faint line or what. Tweak please if you can! UPDATE: took another test this morning and looks to be negative so I suppose the line on the test on this post was an Evap line? Don't know much about Evap lines though. 
UPDATE #2 the test I took this morning I just checked again and there isn't even Evap line so I don't know what to think 🙄 why would one test get an Evap line and the other one not?