A knock at the door

So excited! My first ever package arrived today and I wasn't expecting it. My mom actually saw it on the porch and brought it upstairs to my door. I didn't even know she was here but I did hear a knock on my door, but ignored it because no one said anything. 10 mins later, I came out and saw the package waiting for me. Saw my mom and said "that must have been you knocking on the living room door about my package?" & She said no she didn't knock at all...