Weight gain
You haven't "really" gained 3 lbs. Your body is still very much in a healing phase, and is finding the right balance. Early out, ups and downs are very normal and it all evens out in the end. Be patient with your body. This is a HUGE learning curve - we all want to have lost our weight YESTERDAY, right? But our bodies will be good to us if we are good to them....
Best wishes!