If you are below a 19 BMI, then get concerned. My bounce back came about the 16-17 month point. I hit 121 which for me was too damned scrawny. But I didn't force the stop. It happened anyway and does for almost everyone. If all the DSers I've known, only 2 have gotten below an 18.5 BMI and they discovered one has severe Crohn's and is most likely facing a reversal of the switch. But honestly most of us have 10-25 lbs of bounce back. Good for you.