am I dried up?

This whole week I haven't been breastfeeding my LO I switched to formula and planned on feeding her at night but I never timed it right because at her Last feeding she'd end up sleeping through the whole night. Well for these past few days I haven't been engorged at all, and for two days now I haven't even leaked once. I'm not nursing pad free and haven't leaked once. Does this mean I'm dried up already? If so how did I dry up so quick?