Breasts after breastfeeding

I’ve been breastfeeding my son for almost 10 months now and randomly my left breast is smaller than the right. I pump and pump until they’re as empty as I can get and they are still different sizes. Please tell me they will be the same size when I’m done breastfeeding? I mean they are two different cup sizes and I am very insecure about them. It’s to the point where I am considering implants.