exercise/dieting while bf??

Just curious as to how everyone else is trying to lose weight? my baby is 6 weeks old today and EBF. I have started a mild exercise routine (planks, squats, and sit ups) plus a low sugar diet with lots of protein and smaller portions. I'm really trying to balance eating enough to feel full without over eating. It's so hard I'm always hungry. what am I doing wrong here?! also I'm 5'4 and at 144 pounds. so I'm not terribly over weight I definitely want to lose some and tone!