Hello doctor! Is a 9-week fetal heart rate of 180 beats/minute normal or abnormal? Thank you for your advice.

Hello doctor! On September 26, I had bleeding so I went for an ultrasound and found out I was pregnant with twins, 2 sacs of equal size, 1 sac had a heart and 1 sac did not have a heart (had yolk sac), the 2 fetuses were the same size.