need advice!

i’m 12/13 dpo i took 2 clearblue 6 days earlier tests at about 9/10 dpo, and got faint lines on both of them! i took one and thought maybe it was a evap, as i know blue dyes are pains, so i took the other and the faint line came up within the time frame, ive been taking cheapie strip ones since and getting BFN on them! don’t know what to believe! should i just carry on testing? or leave it?