Faint lines..

So Wednesday I got a faint line around 8pm. Woke up Thursday and took another test around 930am and it was negative. Took another later in the day and it was negative. Waited until yesterday and took another in the am and it was negative. Took one later in the evening and it was negative. THEN took one this morning and its a faint positive. Wtfff! what is going on? Am I pregnant or not? sigh