The cervix is a narrow ring of muscle at the lower end of your uterus that is the passage through which the baby travels during birth.  During pregnancy the cervix changes position quite a few times, and it changes drastically at the end of pregnancy as you begin to labor.  Before pregnancy, your cervix is mostly closed, rigid, and approximately 3 cm long.  At about 12 days pregnant your cervix rises slightly, lengthens, and softens a little from the extra blood flowing to the area; if you are familiar with the feel, position, and texture of your cervix regularly, you will likely be able to tell when this change occurs and may even suspect your pregnancy before you take a test!  During pregnancy, the cervix thickens and becomes sealed shut with mucus referred to as the mucus plug.  This mucus plug acts as a wonderful barrier to keep germs and other infections from entering your uterus and possibly harming the baby…