Weight while breastfeeding

After i had my lil Princess i was doing great i lost 30lbs. 10 during pregnancy ( i don't gain for some reason. With my first i lost 20) then after the extra fluid and baby i lost another 20. Since I've been home I've gained 14 back. I didn't gain with my last while breastfeeding. Anyone elses have this issue? I want to do a calorie counter but non count breastfeeding​and that's part of my diet any ideas?