Heart rate?

Candice • Trucks & Cows ❤️
So I had some major bleeding a few days ago and I went to the ER-- they called it a "threatened miscarriage" but said 9/10 that things would be okay. I was told to wait until my OB-GYN appointment which is January 14. They told me I was 6 weeks 6 days -- 7 weeks but the heart rate was only 99 beats per minute.... I feel like that's really really low... Should I be worried?