A faint line? Or am I hallucinating?

I am 6 DPO. I know, I know, I KNOW that I shouldn't waste a test this early. I know the chances of getting a + are very, very low. I bought one of the most sensitive tests that I could find (25 mIU - Answer Early Pregnancy Test). I waited 3 minutes and low and behold, there is very faint positive line. I'm trying not to get my hopes up, I know that at this point it could just be an error, etc. I'm going to start testing again tomorrow. We are in the early stages of TTC, and we aren't using Cervical Mucus, BBT or anything. We're just going based off of the charting, etc and BD'ing on our fertile days.

Has anyone had this happen? According to my charting, I should have had OV on Feb 9th, but I think it actually happened on the 7th or 8th based on some cervical mucus that I saw, so.. Not to give TMI, sorry ladies, especially for rambling.