Uy, first time mom ka pa lang at 40 weeks na, I totally get your anxiety, pero ganyan talaga ang dilation, sometimes it takes a while before the body decides to really go into active labor, lalo na sa first pregnancy. A few of us from my mom group had similar experiences, stuck at 3cm for days then suddenly things moved fast, so hindi mo alam kung anong mangyayari next. Check with your OB agad if di ka pa makipag-ugnayan, some doctors prefer to induce na kung umabot na ng 40 weeks to make sure baby and you are safe, kaya important na marinig mo directly from yours what the plan is.