S.P.
I used this monitor for almost 2 years trying to get pregnant with my first baby. The first month or so that you use it, it has to adjust to your body's schedule so it will show the "high" reading for longer than it actually should. It will become more accurate the longer you use it. Also, don't pay attention to the lines on the sticks from these as they are not the same as the ovulation tests that come without the monitor. As I said before, I used this monitor for about 2 years trying to get pregnant with my first baby ... Not one time during those years did I EVER get a "peak" reading. I got the high reading at times (not always) but guess what?! I got pregnant anyway!!! :) It was a stressful couple years of trying but oh so worth it! If you have any further questions on this monitor (or anything), please feel free to contact me anytime. Best of luck to you!!