When you are infertile, your finger can easily touch your cervix, which is low in the vagina. The os (“mouth”) is also closed, and the cervix feels firm to the touch. As you enter your fertile phase, your cervix will rise progressively higher in the vagina and will also open and soften to your touch. Sometimes during the fertile time the cervix rises so high that it becomes impossible to reach. If you can’t reach your cervix, you are fertile!