Is there is an option to see my login activity in the past months?
I think my accout was hacked so I would like to know my log in activities. Thanks
There is no way, that I know of, to view log-in history to one's iCloud account.
If you suspect your account was hacked, you should strongly change the password, if you haven't already, and also consider enabling 2-step verification or 2-factor authentication.
You may also want to check you purchase history here -- See your purchase history in the iTunes Store on a Mac or PC - Apple Support to see if there are any odd or unauthorized purchases.
Good luck.