Just got a small question on charts..

I have had a look at peoples charts that are found on the successful charts sticky, and also in their signature and there are a few things that are the same and that is BD'ing on the day you O.

Is there a reason for not BDing on O or is it just cause you arent up to it? I started TTC last cycle, about halfway through with not really knowing much! This cycle I have started to chart and am trying real hard to make this the month and want to do everything correctly!

Cheers