Test advice

Samantha • Started trying again in September. Have pcos and possible endometriosis. Wish me luck! Let`s make a baby my love?
My husband and i are ttc. And I'm 13 days late. I have been like clockwork before this. I have taken several tests
And they are all negative. But i noticed that one that sat overnight had a faint line. Does this mean anything?? I have tested in am and everything. Help!!