Is it impossible for your boobs to be perky after pregnancy/breast feeding?

Esther • I’m better than horrible. EMT and Respiratory Therapist

Expecting my first in Jan. I keep hearing moms talk about how “your boobs go flat after breast feeding” or “enjoy them now because it’s literally all DOWN from here”

I was wondering if anyone out there has experienced their breasts didn’t sag after pregnancy and breast feeding? Is there a way to prevent it or even exercises to help once they do sag?