Hang in there, OP! The 2WW is truly terrible, and I do the same thing analyzing ever symptom. When I was truly pregnant, the sore boobs didn't really started until a few days after my beta. If you are taking progesterone, that could be causing symptoms. BUT you certainly could be pregnant, too -- that's the whole point of the IUI and drugs! Good luck. Let us know. (P.S. I don't know where you fall on this, but I am a big believer in HPTs to relieve the stress of the 2WW. You should get an accurate result if you hold out a few more days.) I myself an scheduling a vacation for 3 days of my 2WW, which started today, and hope it help.