In about 8 months or less I have lost 47 pounds. I power walked and tried to eat healthy. I'm still losing and I'm not walking. Should I be concerned?

Lost 47 pounds. Yes you should be concerned, it is a significant weight loss, but you did not say how much you weigh now and how much you weighed before, if you are groosly obese and were on a diet and exercise regimen, then about 6 lbs a month is a success, but if you are not then you should consult your doctor.