To Change or Not to Change?

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I'm a teacher, and I started using MFP about a week after school let out, so I set my activity level at sedentary since I don't tend to do much when I'm on vacation but sit around and read. I'm 5'4", 132 pounds, and after losing 14 pounds, I'm trying to lose another 5-6.

When school starts back up in another week, I'm wondering if I should change my activity level to lightly active. I'm thinking about leaving it as-is so I don't allow myself to think "oh goody, I can eat more!", but wondering if I'll end up feeling excessively hungry and miserable for doing so.

Any input is appreciated (except, of course, those of a snarky nature; we're not all born with complete fitness knowledge).