Munchkin it's all good, I think we're all so paranoid about every little thing, I actually have to constantly try to distract myself from all of it... it really is like you don't know what to do with yourself! Especially when you can't really tell anyone-- glad I have this board, and I just told one close girlfriend because I've been driving myself crazy!
I don't know about those CB digitals, I think we have different ones over here that don't show any number...? Just preg/not preg. Those sound kind of cool though, so you know how far along you are. So 2-3 weeks, I don't know what that means? Do they count it from last AF or ovulation?
To calculate your EDD, if you know your exact O date (which it sounds like you do) then always calculate from that date. So I ovulated Jan 24, my EDD would be October 17th. Seeing that you are a day behind me, you would be Oct 18!