This occurs at different times in different women. Some women may find that twelve days after ovulation their cervix will do this and is a probable pregnancy sign. Others won t experience this until well after the pregnancy has been confirmed. If you don t feel comfortable charting this sign, then don t do it. And give yourself a month or two to acquaint yourself with the different changes the cervix goes through during the cycle.
Some women actually use a spectulum to observe the cervix.
One that I've often wondered about myself. I am curious about the idea of internally checking your cervix You mentioned that it might not be a good idea, because in doing so you are invading the normally clean vaginal area. Used under License.