Help!!Pregnant or not??? FRER

Hello, can somebody help me out! My cycles are pretty irregular but today I'm on my 45cd, not sure how many days past o. 
I got three negative tests so far, but those were with blue dye tests so I bought frer and did another test with fmu. 
It doesn't look like a positive but when I hold it up to the light I think I see a faint second line... Am I going crazy? Can anybody help me