I’m not 100% sold on these to be honest. Firstly I worked out my cycle and when I should start testing and did so as instructed. The first morning I tested I was showing low fertility the following morning I was shown in peak, a mere couple of days since my period. When in peak, you can no longer use the tests as it stays on there for a few days. I was in shock that I was in peak so early as that just didn’t make sense. Luckily I was quite switched on and after the test was able to be used again a few days later, I kept testing and it said when I was low, high and in peak and within 3 continuous days. Not sure I would trust that process as I could have missed my fertile days all together.