No, blobs that were not committed (or pushed explicitely) are never transmitted over the wire.
If you added files and never committed, they should get removed with the next call to git gc
. If you however committed them, and then removed the commit again (e.g. through git rebase or git reset), they will not be collected because they are reachable through Git's reflog. But the reflog is a local mechanism and will not be published with git push
.