Low fetal heart rate

Hi ladies,

I went in today for my 7 week ultrasound (I have history of missed miscarriage). They found a fetal pole and I measured 6 weeks and three days and the fetal heart rate was 93. My doctor said it’s likely low because it just started beating but I can’t help but worry! Any positive stories similar?

Prior to this I had gone in for an ultrasound at 5 weeks and 5 days and there was a gestational sac and yolk sac so there has been growth. Just so worried! My hcg is rising but my progesterone dropped some. 😖