Awww, I know how you feel. I bought a new scale midway through my journey. I had knots in my stomach just anticipating the new scale. Sure enough there was a difference (why is the difference never lower?). It told me a pound more, not so terrible.
I know you know this already. You hard work and the past 2 week were not negated by the new scale. It 's just a different number. You still weigh what you did before the new scale. Now you have a true and accurate number to go by. Good for you for owning up to it. Before you know it, 4 MORE pounds of you will be gone - for real, and this will all be a distant memory. Keep up the good work. You've been doing really, really well.