Drying up on one side?

Bella

I feed my baby on one side per feeding about every 2.5 hours. Since yesterday, I will feed my baby on the right, but when it comes time to feed again, the right side will be leaking and full and the left will feel soft. Could the left side be drying up?

I'm 4.5 months into breastfeeding. I've been wanting to transition to formula but now that I think I'm actually drying up, I'm sad that breastfeeding could be over soon lol