Clear blue fertility monitor?

I have something similar, it is called a 'persona' monitor. I actually bought it to use as a natural contraceptive. The thing is I have irregular cycles too and the monitor I had worked best and was more accurate for those who have more regular cycles. It's been a long time since I used mine so I can't give you an exact reason why and it's packed away with stuff in storage or I would have a look at the instructions for you but I would check that's not the case with the clear blue one before you go spending a lot of money on it. Otherwise I see no reason not too. If it's going to help then it would definitely be worth it! Good luck, your son has a great name by the way!!!! Xx