Help please!

Ok ladies AF was suppose to make her appearance on 8-10-15 and still has yet to show up. My boobs have been killing me and I have been nauseated for over a week. I have taken several test with BFN. The test I took today was showing positive before the 3 minute mark but once 3 minutes hit it was negative and the test looked funny is this a faulty test. Please give me some advice! Thank you in advance!