I'm absolutely baffled by this! Is this normal?!

[nightingale]

I got this orchid for free from my old job at a garden center. After all its flowers fell off, it started growing a new bud.

Thing is...it's kept growing...and growing...and growing...and growing! The bud on this orchid is SO HUGE that I'm not even sure if it'll actually bloom! And if it does, I presume it'll be a monster of a flower!

It's current environment is in my bathroom. I have a heating lamp and I take showers, so I'm certain that it is the steam and the heat that it really likes. I'm watering it once every 4-5 days to keep it moist. I'm thinking it might need to be re-potted, because its roots seem a little cramped.

The bud is currently about 3.5 - 4cm long and fat.

Is this abnormal? Also, what could you all suggest on getting it to bloom?