Every woman's CM is unique to her, so don't expect that it has to follow the examples you see on websites or in books. Just start tracking it to learn your own patterns. A few tricks of the trade:
1. Don't focus too much on how it looks. Pay attention to how you feel during the day when you're walking around - do you notice wetness? Do you feel nothing? Do you feel lubricated or slippery? Do you feel sticky? Things like that. This is called vaginal sensation. Write down what you feel every day.
2. You can
feel CM even if there isn't enough to
see. A wet or slippery feeling is CM, even if you don't see anything!
2.
All CM before ovulation is potentially fertile. It can keep sperm alive in your body up to 5 days, even if it's not clear. CM that makes you feel slippery is the
most fertile. BD when you notice feeling slippery if you want to maximize the chances of conception.
Here's some more information about CM from the Billings Ovulation Method. We've used it for 5 years now, both to TTC and to TTA.
Key to Fertility Control - the Mucus