Late period??

Hey guys so last month I missed my period by 4 days supposed to come on 18th but came on 21st. So does that mean it’s normal if my period came on 21st this month too?? Or am I late again cuz I didn’t get my period on the 18th?

Really need help here cuz I’m really confused by my cycle😫😫😫 I don’t think I’m pregnant cuz I didn’t have sex and I ovulated this month

So ladies plssss give ya gurl sum advice