Im 37 Female, Very Healhy And Fit, As In I

Im 37 female, very healhy and fit, as in I run a lot, regularly run 8 miles a few times a week. Slim build, off cigarette now for 8 weeks but I was only a social smoker really. I'm having a lot of palpatations the last few days. Maybe a 3-4 every hour. Im not stressed or anything. Should I see my GP?