Uy, first time mom ka pa lang kaya totally normal ang anxiety mo! Pero honestly, hindi lahat ng babies follow the textbook, some mamas don't feel anything until they're already in active labor, so don't stress too much pa. The best thing talaga is to follow up with your OB especially since you're almost 39 weeks na, kasi sila lang ang makikita through ultrasound kung lahat okay with baby and kung ready na talaga ang body mo. In the meantime, stay active (walks help!), eat well, and rest, your body knows what to do even if you don't feel the signs yet, promise!