Could it be wrong?

Kelsey • I have been trying to conceive my second child for two years... I am so happy that it has finally happend!
So I took a pregnancy test in dec. 25 and got a BFN.
AF is due on the 27th. 
But my nipples have been sensitive, my boobs have been sore, I've been moody, and now I've been having indigestion and diahrea. .
Has anyone taken a test 2 days before AF and got a BFP but ended up being pregnant ?