CB fertility monitor question

hlmlvt

Well we are TTC this week,  I decided to buy a CBFM today it should be here next week.  This way I have it to start my next cycle if we are not pregnant this time.  I figured I can always sell it if we are.  I have been wanting to get one for a few months but have not.

We got pregnant first try back in Dec, ended in Feb w a MMC at 11 1/2 weeks.  We just started TTC last month and I know that I was super lucky at 38 at the time to be able to get pregnant the first time.  I even told my hubby that it will take months.

My question is has anyone used a monitor?  Are they easy to use? When do you start using them when CD1 starts?  I figured it would not hurt to start using one along w the Wonderflo's and the digital confirmation of OPK.

Thanks