...then surely there'd be enough hCG to get a BFP?
I know hCG doesn't cause the ouchiness, but it does have something to do with progesterone production, and iirc progesterone does cause ouchey boobage.
So I'm imagining that in order for there to be enough pregnancy hormones floating about to cause symptoms, then there'd be enough hCG floating about to give a BFP.
I very much do think that I'm experiencing a PMS bonanza rather than pregnancy, but all thoughts welcome 