Yes, and No.
I used clearblue easy fertility monitor - it only detected ovulation once.
(I do tend to not ovulate and had to take fertility meds)
Using it again, it has been completely unreliable and I have switched to using the OvaCue which has already (on CD9) told me what day I will be fertile.
The ovacue is hugely expensive so, I wouldn't recommend it if you're not having problems TTC but, if you are, it has been incredible.
There are a lot of people that have success with the cheap-o OPK's online, the strips, so I would recommend those. That way you can take more than one a day and not worry.
