Friday night you just stay up all night. Or sleep on a tarp, in line. Or in your car. Or stay with friends in a "regular" campsite. But you probably won't have anywhere to put up a tent. Most people will be in line. I'm not there yet and already I'm in line! (thanks Duk Tape Man)
Saturday morning, at 8am, Big John or someone from PB will show up with a radio and they'll say "go" and it'll be on like a pot of neckbone.
So if you're staying in Montrose, you should be shooting to roll in to Town Park around 7:30, which leaves you time to stretch for land rush and get your tarps together.
As for pregnant, I'll defer to those with experience!