Hi there, I started using it with a 24 day cycle, at one point 22 day cycle and now I am on 27. Have you recently stopped taking The Pill? That can have an affect. The monitor did pick up my surge straight away though. If there is only your 2nd month of using it it is likely it is still getting to know you and has not yet picked up the surge. It does not nec mean you are not ovulating at all. Do you get any other signs that you are ovulating?