Is someone using my account on FB?

[Connor]

Yes, you have clearly been hacked. But if this person hasn't logged out of your Facebook they can still access it, unless you temporarily de-activate it (don't worry, it's easy to re-activate, I've done it about four times before when I originally planned on leaving FB permenantly). Or, after you have changed your password, add a security question what only you would know (Your first pet, where your mother was born etc.) Hope this helps!