Not necessarily. It's basically up to your body and how it will labor. Some women can be 100% further dilated and still only be in pre-labor(a.k.a prodromal labor). I went into preterm labor at 35 weeks which they stopped at 36+4 weeks I was 100% and 5cm and was in pre labor until I had my son at 38+1 weeks. But there is a possibility that you could be stuck at 30% for the next few weeks and then once you have 100% you will go into labor soon after