Digital saying not pregnant but there is two faint lines

Celeste

im so confused.. I’m 4days late now and I took the first two test on the 7th and then I took the clear blue digital and it said “not pregnant” but I opened it and saw two lines (one faint). I am young and I don’t really know who to talk to and all I want is a yes or no answer. Do clear blue digital always have two lines

ps: I’m on birthcontrol and have been for 5-6 months now.