No falls, no lifting out of the ordinary. I've had a broken rib before and I'm sure this is not that. Definitely a different (and much duller) pain.

Anyabeth, that sounds like it.

I went ahead and called the bike fitter, and am going to go in when I have my shoes and pedals. My shoes should be here Monday, so hopefully next week. I still feel a little silly and self-conscious about it since I'm a complete beginner, but I guess I'll just have to get over it. Thanks for all the help!