How do I know if I am using photo stream?

Hi yeceniap,

Unfortunately, My Photo Stream has been permanently shut down. You should be able to access those photos from the device where you took them. Apple recommends iCloud Photos as an alternative (which indefinitely stores photos; however using iCloud storage.)

You might have used My Photo Stream if you synced photos between devices wirelessly and without iCloud Photos. As My Photo Stream has been shut down, the My Photo Stream toggle has been removed.

Hope that helps!

It has been shutdown. No one is using it anymore.