High Pulse rate. Please guide me.

From the last 2-3 days i am having stomach discomfortness such gas trouble, burping and gas passage. Today i went for checkup it shows spo2 normal but pulse rate is around 120-121. The doctor prescribed crp and cbc. Which all are normal crp is 0.50 mg/dL. Internal fever was there but taken calpol 500. Now i am okay. I want to know that whether this high pulse rate is due to heart disease or problem. I underwent ECG and TMT on Feb-2021 for chest pain and there also reports are normal. Doctor suggest it as acidity. From that day and till before 3 daysall was normal. But from the last 3 days i am having stomach gas and discomfortness. But this high pulse is causing me anxious. Most of the blood reports are normal. Then how can pulse increases. ECG and TMT done on FEB-2021 is attached. Please guide me.