Can my landlord (Property Management) enter my apartment without a notice?

I live in North Carolina and my property manager entered my apartment without any notice. We keep our doors locked and our apartment complex has ALOT of inspections.... Example: last month we had 3-4 inspections, 1 was state inspection and the calendar mail letter says another one at the end of April!! Anyway they always attach a letter to our door about a week prior to anyone entering for all the inspections or.. check fire extinguisher, check fire alarms, change air filters, exterminator treatment..... Anyway back to the main point. They have always given notice and I work 2nd-3rd shift 7PM- 3AM which they know. This past Friday around 9 AM I had only been asleep for a few hours and I wake up to her screaming in my living room then opening my bedroom door where me and my spouse was sleeping and kept screaming for Josh.... I was seeing if he was Ok... I was like no, my name is Robbie... Then she was like sorry and left. I was groggy and half asleep. When I woke up later that afternoon I noticed she left my door unlocked which I don't like while we are sleeping! Anyway is any of this legal? I hate the way this place is ran and our lease doesn't expire until February next year but it was a mistake renewing it a couple months ago. What's thoughts on this?