<s>[INST] I m 33 weeks pregnant and up until a few weeks ago my resting heart rate was in the 70 range. Now it s regularly 110-115. I m also having swelling in my left leg and it s achey from the thigh down. I see my OB today, but I was just wondering. [/INST] Hallow Dear, Swelling during pregnancy can be due to following common conditions:1. High blood pressure (maybe essential or pregnancy induced) 2. Urinary infection: The swelling is usually found on the face first, more in the morning. May be associated with burning urination3. Anemia: Pallor is noticeable. Usually and unfortunately it is misinterpreted as fairness in the complexion due to pregnancy. 4. Hypoproteinaemia: Low proteins usually go with anemia or liver failure. 5. Liver failure, Jaundice, etc. 6. Heart Failure7. No pathological cause. Please get your blood examined from the laboratory to rule out any of the above-mentioned conditions. Since you have a history of the irregular pulse varying from 70/min to 115/min, the cause of edema is more likely to be related to heart functioning. It is good that you have taken an appointment with Obstetrician. With his/her advice, you may plan to visit a Cardiologist also. Please consume high protein, moderate carboy Chat Doctor.  Take daily iron, folic acid and calcium tablets. Have close monitoring on hemoglobin percentage since this even complicates the other conditions responsible for edema. I hope this helps you.  </s>