Check these things:

Your total calorie intake needs to be 10 to 12 cals per current weight. I know it goes against the grain of everything we have been programmed to believe, but its true.

Up your water intake dramtically.

Your clothes are getting looser so that's a sign that it is working along with being in ketosis. You are burning fat.

3 lbs is 10% of what you want to lose, that's great!