When you ovulate the cervix is easier to reach, a bit softer and slightly open to receive sperm. At this point your cervix may feel more like your ear lobe.
There are other signs of ovulation that women may experience in addition to the 3 main signs. These are called secondary signs and may not happen as consistently, if at all, for many women.
These may include: Light spotting, Slight cramping or pain on one side of the pelvis, Breast tenderness, Abdominal bloating, Increased sex drive, Heightened sense of smell, taste or vision.
Women with cycles that vary a bit in length, but are nevertheless roughly every 30 days or so can also get some utility from this method. She can record the first day of her period for 3 consecutive cycles. From this information, she can get a pretty good idea of the week when she will be ovulating the next month.