My blood pressure is 108 over 63 with chest pain could i still be having a heart attack? pulse is 63 a and i have used nitro spray which helps

Possible: You can be having a heart attack with ANY blood pressure. It neither rules it in nor out. Nitro spray helping is also non-specific since nitro spray also helps acid reflux and esophagitis. If you think you might be having a heart attack, the only option is to go to the ER. Since someone gave you Nitro spray, clearly you have been evaluated. Without that information, further advice isn't possible.