Wondering if there's such a thing as a false positive? I am pretty regular, and I'm "due" to ovulate on the 21st (Tuesday). Took a test yesterday and it was negative, as I expected. Took a test today and it had skipped right over "high" fertility to "peak" fertility. My question is...is it possible for it to calculate "peak" fertility after only taking one test? Is the first test always negative? I thought it was supposed to give me the four best days?