Temperature stayed high, but still no positive LH test!

Either I've got a strange chart where I'll test LH positive after a temperature spike, or I missed the LH surge somehow. Or maybe there's a medical problem? From what I understand, you can have an LH surge with no egg, but you don't have a pogesterone surge (indicated by the temperature spike)with no egg, though I could be wrong.

Well, we've been BDing every night since the middle of my cycle. So if a egg snuck by, it should have some little guys waiting for it! LOL.