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 on dec25 and got a BFN, AF is due dec. 27th. 
But I'm still holding onto hope that it may be wrong because my nipples are sensitive, my boobs are sore, I had really heavy creamy CM for a few days and now it's gone, then today I wasn't able to stay off the toilet and had indigestion.
Has anyone taken a pregnancy test 2 days before AF was due, got a BFN and it was wrong?