1. It is normal to have a higher heart rate during pregnancy. During pregnancy, the woman's heart must work harder because as the fetus grows, the heart must pump more blood to the uterus which causes your heart rate to rise. During pregnancy, the amount of blood pumped by the heart (cardiac output) increases by 30 to 50%. As cardiac output increases, the heart rate at rest speeds up. You did not say how high it was though. 2. I can't find anything where heartburn causes an elevated pulse rate. I have heart burn (I am not pregnant) and it does not cause my heart rate to increase. Again I can't find anything to say it does. 3. The first answerer had some good points to help with your heart burn, but I believe he missed the fact that you were pregnant. You should not try to lose weight if you are pregnant and I know you are aware of that. 4. Talk with your doctor and explain to them that you are having bad heart burn (you may already have). I would not take anything for it without consulting with them first since you are pregnant. Also inform your doctor of how high your pulse rate gets sometimes since you did not say how elevated it was just to be on the safe side. 5. I have had several friends complain of bad heart burn during pregnancy and then after their pregnancy no problems with heart burn. It would probably be okay to take a Tums or something like that, but still talk with your doctor first just in case. 6. And..I just wanted to say congratulations to you! I hope all goes well with you and your new baby. Best wishes.