Hi..I Am 36 Years Old Male. I Am Very Conscious

Hi..I am 36 years old male. I am very conscious about physical fitness and do gym regularly. Just today I checked my BP was 120/90. I was feeling slight stretch on my left side of the chest, maybe it is due to work out in the gym, I don't know. I also have gastric problems but not so severe. What is your suggestion? Should I be worried about my BP reading?