If im a part time associate, but working a full time schedule (40hours a week) am i entitled to be made full time status?

at my job depending on the season part timers hours can change from any where from 24 hours a week to as low as 4 hours a week. i went from working about 12-24 hours a week. to working a full 40 hours a week for the past 3 months but my status has not changed from part time to full time, so i am not receiving the benefits (vacation, sick time, etc...) of a full time employee, but im working the schedule of one. and i want to know after working this shift consecutively for over 3 months if i am entitled by law to have my status be changed to full time.