In the Womb was on the National Georgraphic Channel last night and was truly amazing. There should be repeat broadcasts so I would check your local listings.
What is In the Womb?
From their website: From a single cell to a complex, self-sustaining organism. With ground-breaking photography, computer graphics, and 4-D imaging, In the Womb reveals this amazing process as the first heart cells begin to beat, the nerve cells flicker to life, and the senses develop.
If you don't get that channel, visiting the website is also great just to see the photo gallery.