3 week stall 1 week early????
It sucks doesn't it. Everyone will tell you to put the scale away, and not weigh everyday. (As if) But your weight WILL continue to drop. Look at what you are eating and ask yourself if it is humanly possible NOT to lose weight with only that miniscule amount of food. It isn't. Your body is taking a minute to readjust, and all you can really do is wait it out, and Keep up your water and protein intake. It'll pass.
I stalled at 3 weeks for 10+ days and again at 8 weeks for 6 days, but I'm still averaging about .75 lbs a day, and that ain't too shabby :)
My stall started about a week early also. As long as you're on plan, just stay the course. The stall will break, I promise. Mine lasted about two weeks, but then once it finally broke I shot down several pounds over the course of just a few days before things leveled out again. Make sure you're getting plenty of fluids in, and just know that this too shall pass.
Two things! #1 Drink more water, you may be retaining water and you need to flush. #2 Don't let it get to you. It will pass.
Make sure as you add additional exercise that you are getting additional water too. Any water you consume because of exercise should not count toward your Minimum 64 oz per day.