Weight loss and BF

I never thought I’d be this person. But is anyone else exclusively breastfeeding and loosing a bunch of weight? I was 170 when I got preg, 200ish when babe was born and now 150. Which is a normal weight for my height But i don’t want to loose more. I eat all the time, try and keep up my calories. I feel fine, I’m just a milk factory. Is anyone else experiencing something like this? My milk is steady, baby is gaining and hitting milestones. My mom who is in the medical field says it’s the calories burned from breastfeeding and recommends I eat more protein. I guess I just want to know if anyone is experiencing something similar??