On my way home from cram school at night~.....

(What actually happened) One day, I was walking home around midnight after finishing cram school. The swings were moving with no one around, so I stopped and sat on one for about 10 minutes. When I got home, I felt a chill and called out for my mom. She had left a note on the desk saying she was going grocery shopping. So, feeling scared, I turned on all the lights and started watching YouTube. Suddenly, I felt a chill on my shoulder and said, "Come out, I know you're there." Since no one was there, I started making spicy chicken noodles. Then I heard a sound like "Ugh... ugh... ugh..." from somewhere. I started crying and called my mom, asking "Mom, when are you coming home?" and she replied, "Ugh... ugh... ugh..." So I threw my phone and when my mom came back, I said, "Mom!!! I called you, why did you say 'Ugh... ugh... ugh...!!'?" Then my mom said, "I never received your call." (Interpretation: My mom didn't answer the phone saying 'Ugh... ugh... ugh...', it was a ghost making that sound.) Freaking creepy.