I don't know if I'm pregnant or not

hi guys, i'm going through a very confusing time trying to concieve. Today makes me 7 days late on my period, I've took probably 5 test over the 7 days and seen a little bit of a line, but not really getting darker over the days. 

ive been having some symptoms, nausous when I wake up, and around 9-10pm, back pains, head ache, and sore/tender boobs (feels like they're being tasered when I'm in the shower) 

here are some pics of my tests