I'm guessing very. My doctor told me that you can get a false negative (test reads negative when actually pregnant) but not a false positive (test reads positive when not pregnant) with an at-home test. Also apparently with a blood test, your hormones increase for a while, and then decrease, which could explain why they thought she was only 2 months. What I don't understand is how the pig didn't feel any movement, or mistook it for something else. Also, I'm not surprised the pig needed a C-section... some doctors will let you deliver breach. My baby was nearly twice the size of hers (but he was head down) and I pushed him out all on my own. Fats are useless at everything, even the sole job nature has designed us for