You produce CM at various stages of your cycle. It is the relative change in the texture etc. that you are looking for during ovulation. ie. CM is very wet, stretchy and thin at ovulation. Usually referred to as eggwhite texture. CM after AF can be dry, sticky then moving to creamy, wet and finally eggwhite at ovulation. then immediately after ovulation it will dry to maybe creamy, sticky and dry again. HTH.