Slown Fetal Heart Pulse

Ana • Officially PREGNANT With #3!
Today I was told to go to the ER. Even though I went for left side pain. I got an ultrasound and the baby is in the uterus, HcG is at 3300+ I believe he said. But he said the pulse rate is 93bpm which is low and should have it montired. Is this a bad sign? Should I be worried? Help please!