just don't get caught up in measurements. They mean virtually nothing when it comes to how quickly the baby comes. There's a chart that has been used for years to predict labor stages and dilation times and only 50% of women match the chart, but the hospital still expects you to meet those expectations or they come out with all the ridiculous interventions... The balloon, the pitocin, the membrane sweep, breaking your water---- all of those can cause harm, especially if the body is not ready.
Trust your body. Wait on it and nothing else.