I spoke to my doctor a few hours ago, and my beta didn't go up between Tuesday and Thursday. She told me that I am not definitely out, as she has seen pregnancies "take off," but she is not optimistic. She told me to call her if I start bleeding, and otherwise, I'll go in for a sonogram on 7/6 to see what's going on.
I was a mess for a few hours, but now I'm trying to be positive and hopeful that I'm just a little slow to start. My last PG ended at 5.5 weeks, and I'm so scared that this is a repeat.