The third charting option is the cervical position. This is strictly an option and while some practitioners do not recommend this - if you do chart this be sure to thoroughly wash your hands and keep your nails trimmed before sstarting. If you have never checked your cervical position before it could take a month to understand what all happens. First you take one or two fingers and gently slide them up into the vagina. This is best done while sitting on the toilet or squatting.
Some women even lie down.
Try to check it the same way each time because any change in position will change the position of the cervix. The cervix feels like the tip of your nose. If you have had children before, the opening will be more of a slit than a pinpoint circle. After menstruation, the cervix will be low and firm - feeling like the tip of your nose. The opening opens slightly - to allow sperm entrance into the uterus.