Hi littlemissmischief. Didn't mean to make you feel left out, sorry
CD is the number of days into your cycle, so the first day of your last period would be CD1 and so on. I'm guessing from what you've written you must be about CD23, but that's only a guess.
The number of days between your period and ovulation can vary. Ovulation is usually about 14 days before you next period, so it depends how long your cycle usually is. If you have very irregular periods it will be difficult to guess when you ovulate.
As an example, my cycles at the moment are between 26 and 32 days, so ovulation would be between day 12 and 18 (counting from the first day of my last period)
Hope all that makes sense