Fetal pole

Kendra

Any advice? I’ve had two ultrasounds the first one they estimated from the size I was roughly 5 weeks they seen gestational sac, and yolk sac no fetal pole. Two weeks later I had another ultrasound so roughly 7 weeks and they said they seen the gestational sac, and the yolk sac but no fetal pole again..should I be worried? Anyone else had something like this?