Ay, normal lang yan mama! A few of us in my mommy group didn't feel contractions until almost 39-40 weeks, kaya don't worry too much, bawat mama at baby ang timing nila. But since you're already 38+ weeks, definitely check with your OB on your next visit or call them if you're concerned, para ma-monitor lang proper ang baby at makita kung may signs na ng labor na hindi mo pa nararamdaman.