low heart beat

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Had an ultrasound today, we thought I was 8 weeks. I'm actually 6 weeks 1 day. The baby's heart beat is 98, they told me it was low. It should be around 180 or less. They told me to keep an eye out on bleeding and to take it light, they're might be a chance of miscarriage, they just don't know for sure. Anyone had this happen and the baby is ok? I'm really worried now 😔 ☹️