1st ultrasound question

Stacey • Married 💏7/22/17 👼 baby 2/8/19 👼 baby 5/29/19 🌈 👶 Claire Marie born 1/1/2021

We were about to see a flickering heart beat but unable to detect the beats per minute. My due date got pushed back so now I'm only 6w1d. Would you be worried?