It IS a huge shock -- I can remember just thinking that it changes your whole life, in just a moment. But in a good way!
I hope you have tons of fun at your pledge party -- I had soooo much fun at ours last semester. We had two, one on Friday and one on Saturday, with DU's philanthropy sorority volleyball tournament on Saturday morning, so I spent much of those two days at the house and hanging out with my sisters, getting to know them -- so much fun! I hope you keep us updated on your new member period.