activity level

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Hi I'm new to this and this and I have a rather um silly question. The activity level, so i work a desk job but i walk 5 miles a day so what activity level would i be, I have been here for a month and have lost 15 pounds i had my level at sedentary but my weight loss has stalled for about two weeks or a little more and im worried i may have cut my calories to low. Any suggestions would be wonderful.