Idk why I didn't think of this before! I'm EBF, but I'm only planning on going 6 months (so I can…

Idk why I didn't think of this before! I'm EBF, but I'm only planning on going 6 months (so I can get back on my migraine med). I've already started pumping extra to get ready for going back to work. Then it hit me-if I really work on pumping as often as I can, maybe we can stock up enough to use less formula later on (or none if I get lucky)! Have any other moms tried this before? If so, how did it go?