That heart rate sounds fine, and there are so many things going on with your body that you'll get pains, twinges, and such. BUT!!!!!!.... don't underestimate your internal gut feelings. If you feel something is not right, go to the Dr. You'll regret not going and hate yourself if something happens between now and 4 days from now. A quick call to the office doesn't hurt for a professional opinion.
But... for all you know its indigestion! :-)
Good luck and congrats!