My period was 3-4 days late and only lasted 5 days not my usual. now im 9 days into my cycle and have light bleeding what could this be?

Normal variations: Your periods occur because of changes in hormones within your system. While a lot of women have a period every month around the same time, there is variation from cycle to cycle. Ie – a period may come on a few days earlier or later and maybe heavier or lighter depending on the endometrium lining. It may come continuously or with intermittent spotting. These are variation of a normal process