low heart rate

Britany

My first appointment was the 8th of this month. Well my ob moved my due date back a week. Putting me then at 6w 4d then. The heart rate was 112. With my first born at 7w 2d his was only 120. I miscarried back in 2012 so it really scares me to have it happen again. I didnt handle first one well at all. Should i be worried that it was so low??