Am I active or lightly active

I would agree to say "lightly active". If you feel like you're more active, then change it.

I work in a similar job. I work two days first week, four days second week. Some days at work I know I walk several miles from one place to the next, but others I may not walk nearly as much. I first put active, then I changed it to lightly active. I figured its better to put less and burn more, than to put more and not burn enough.