I really wouldn't be too concerned just yet. 2 1/2 months is a very short time to have been maintaining, you're body is likely still stabilizing and figuring out what is going on. If it persists you only have two options, increase cals or decrease exercise. And yes a range is very important. Mine is 5 lbs, 138-143, right now I'm outside of my range because I've been overeating and I know that and I know what to do. I'm not sure how tall you are, but I assume you're not under weight? If you are then maybe this is more critical, if you aren't then just be patient and wait for your weight to stabilize.
268 lbs - Journey Begins (January 11, 2006)
197 lbs - 71 lbs lost (October 15, 2007)
247 lbs - 50 lbs gained pregnancy (August 22, 2008)
195 lbs - baby weight gone (July 7, 2009)
168 lbs - 100 lbs lost (March 26, 2010)
148 lbs - GOAL! 120 lbs lost (July 18, 2010)
138 lbs - 10 lbs under goal (December 29, 2010)
PR 1/2 Marathon - Time 1:59:50 (November 11, 2012)
PR Marathon - Time 4:40:53 (March 18, 2012)
Today 140s & training for my Health
"There is nothing you can't have tomorrow so there is no reason to eat it all today."