Low Cervical Position
Right after your menstrual period, the position of your cervix will be low and easily reached by your fingertip.  This should be charted on your spreadsheet by logging   "L" or "Low".  At this time, a cervical position of low is considered infertile.

Mid Cervical Position
Closer to ovulation your cervix will start to rise.  This is caused by the increasing amount of progesterone in your body.  Your cervix will start moving a little higher within your body but can still be reached rather quickly with your fingertips.  This should be charted on your spreadsheet by logging "M" or "Mid".  At this time there is a possibility of being fertile.

High Cervical Position
A day or two prior to ovulation your cervix will rise to its highest point.  It moves to this level due to the amount of progesterone within your body.  When checking for the position you will notice that it is almost difficult to reach your cervix and should be logged on your spreadsheet as "High".  Note:  Due to the unique way the Charting Consultation Service logs to show at a glance when your peak time is - the letter "X" (extra high) is used for their fertility chart.  At this time you are considered extremely fertile. 
 

Hard Cervix
When you begin checking your cervix the day after your menstrual period has ended, you will notice that the feel of your cervix is rather hard.  It will feel almost as you are touching the tip of your nose.  This should be logged on your cervix as "H" or "Hard".  At this time you are considered infertile.

Soft Cervix
Closer to ovulation your cervix will start to soften.  This is caused by the increasing amount of progesterone in your body at this time.  It may feel almost like touching your bottom lip.  This should be logged on your spreadsheet as "S" or "Soft".  When cervix is soft and high you are considered extremely fertile.

Closed Cervical Opening
When you begin checking your cervix the day after your menstrual period begins you will notice that there is a small slit or a tiny round hole (usually women who have given birth will feel a small hole instead of a slit) which is the opening where sperm enters.  The opening will be very small at this time and should be logged on your fertility chart as "C" or "Closed".  When your cervical opening is at its smallest (closed) you are considered infertile.

Open Cervix
Closer to ovulation you will notice that your cervical opening begins to enlarge.  This makes it easier for sperm to enter into the cervix.  The slit or hole will become larger and will feel very open.  This should be logged on your fertility spreadsheet as "O" or "Open".  When your cervical position is High, Soft and Open you are considered extremely fertile.