Pregnancy dream.

Granted it is on my mind weather or not I've conceived each month as AF is near... but I had such a vivid dream last night that I was pregnant.... my period was due today, I normally get it overnight and it is literally never late but theres no sign of it. I was feeling pretty excited until I took a pregnancy test and it came up with a bfn ( it was afternoon urine and I had just drank 1.5 liters of water) is anyone else in the same boat? I'm just getting a bit disheartened at this point.