The very first day your period is expected to start and it doesn't, is considered the first day it is late.
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Yes. From the first day of the last period you had - count forward 28 days (or when you expected to start). Day 29 would be 1 day late.
28 Days
How many days does the month of September have? Enter the number, and put a period after it.:
How many days does the month of September have? Enter the number, and put a period after it.:
Your period. It sounds like you are having one of those early or late, or caught in between cycles. Are you emotionally distressed? It should be happening around every 28 days.