It might have been too early for a blood test, especially if the ovulation date was uncertain. You might not be far enough along to get a reliable reading. The progesterone test should tell her for sure if you ovulated though, and she can use that information to assess your dosage. I guess if a negative pregnancy blood test comes back, that wont be able to help her as much as the ovulation blood test.

Good luck and I hope the witch stays away for you.