I wouldn't worry about until something happens. My wife started at the same weight as you and now she is 150 pounds with no plateau. i have lost 80 and have had a two week stretch with only .5 pound loss but that was it. Just stay focused and eat good and see where it goes first! And congrats on your healthy choice of life now!!
Started weightloss Nov 24 2009 302lbs
Started Fitday: February 19 2010 263lbs
Currently weigh in at 220 lbs
Jan 1 2012 goal 202 lbs