The CBEFM tests in lots of 10. So in other words, if you don't get your peak within the first 10 lot, then it asks for more sticks for another 10. that is why they sell the sticks the way they do, so that you don't use different sticks from different lots. In terms of the Peak, the second peak is an automatic peak. Once you get the first peak, it automatically gives the second peak the next day. The trick is to figure out when you really ovulate...is it the first day or the second? The only way to know that is to temp and use OPK's as a back-up.