no, you won't - not with that large calorie deficit. As others have said, you'll hit stalls along the way and your weight may fluctuate occasionally by a pound or two, but if you stick to your clinic's plan, your trend will be down. I didn't start regaining until I hit my lowest weight (in the 130s), but it's VERY common to gain 10-20 lbs after hitting your lowest weight (the rebound gain is usually in year 2 or 3). But while you're in the losing phase, as long as you're sticking to your plan, no. You'll continue to lose.