First: Congrats on the weight loss!
Now, 11 lbs a week would only be unhealthy if you continue that for many, many weeks to come. Your first couple of weeks with losing weight (especially the very first week, though) you will see higher numbers as your body drops water weight & adjusts to new food.
Also, those of us who have more to lose often do lose higher numbers for longer periods of time. (I actually lost 6 lbs my first week, and 4 lbs for a couple weeks after that, though it's slowed down a little now.) We cannot expect that every week from now until the end (hah, it'd be so easy to get to goal!) but there's no need to panic if it happens for a few in the beginning.
So, celebrate your losses now, but accept that they may go down to a "normal" weight loss a few weeks from now.