So my Beta didn't double-- but it went up by 50%, which the RE said was what they needed. It's still early. I'll keep taking HPTs to see the line get darker (I'm staying positive because my boobs are still really sore, I'm gas-alicious, and I am peeing often) over the next couple days and I'll retake a 3rd beta on Monday or Tuesday if I feel the need to, though the RE said it's up to me.
I called my OB and am going to see about getting some progesterone supplements for this early time, just to be on the safe side.
I've sent out the email to my parents, so it's semi-official, now I guess!
The only way this could be better is if at least a few of you were getting some BFPs, too!