Confused about these clearblue fm results

[MinnieMin]

My cycle is usually 34 days, I ovulate around day 18-21, and we've been trying for around a year, with sadly one mc in that period.

This month however, when using the CBFM, it stated my LH was "high" on 1st March and it has been since then, including today. My BBT temps were high around the same time indicating that I must have ovulated earlier than usual (day 15) but the CBFM still says LH surge / high, seven days later.

Is it the CBFM that's giving dodgy readings? Does anyone else check using it, I've just recently started using one. Thanks!

I use the monitor as well. When I used it for the first time I got a very long "high" period. As the monitor not only looks for LH but also for estrogen, I think it's quite reliable. But that doesn't mean it can be faulty as well. I'd suggest to keep testing and see what's happening?
Did you buy a new one or did you buy a used one?

Thanks, I'll keep testing. I bought a new one, and last month it was normal readings, showing the surge/peak for two days. But this time around, it was a high - which remained for seven days (and counting).

In contrast my BBT indicate I have already ovulated as the temps are high.