There's nothing wrong with planning a few restful days. In fact, if what we're after is a healthier life, then knowing that you're going to need some rest -and- planning for that... is healthy!
You're balancing what needs to be balanced. As long as your plans include your exercise for the day after the 3 rest days (so you won't be tempted to stay away from exercise too long), then you're golden.
You've lost 25 pounds. That's not going to change after those three rest days. No guilt needed.