Should i go to the er?

Im not the type of person who goes to the er or doctor often. Im almost 29 weeks pregnant and My heart rate has been out of control lately. My legs and body feel heavy, im short of breath and feel weird. today was the first day that i got very close to fainting and had to sit down immediately. Its resting at 130 and during these spells its shooting up to 160+ With very little physicalactivity  especially if im standing. Im afraid if i go itll be normal and ill just get sent home with nothing done.