You may think your period is late, but it could just be a natural variation from your usual cycle. Many women see some variation month to month in their cycle, usually around two or three days, so you may get your period on day 27 one month, and on day 33 another. However, for some women the variance is even larger, where 46% of cycles can shift by 7 days or more, and 20% by 14 days or more.