Hay, totally normal yan! A few of us moms didn't go into labor until 39-40 weeks, kaya walang rush, basta baby is healthy and moving, you're good pa. Some babies are just chill talaga, hehe. If your OB is happy sa ultrasound and monitoring, that's what matters; I'd just ask during your next check-up kung ano signs talaga to watch out for sa inyo specifically, since bawat pregnancy is different naman.