Ovulating tests..

Britny β€’ Babies 1&2 coming in August 2015 πŸ‘ΆπŸ‘±
I use CB digital fertility monitor and advanced digital ovulation test. I get varied results. Example: yesterday the fertility monitor told me I was "high" and the advanced digital said I was "low". Today they are both on the same, thankfully to ease my confusion! I'm not sure if anyone has had a similar problem, or if it's just me. Any advice/suggestions are totally welcome!