George Stamp in the foreground holding the coffin, represents George Grenville. Lord Grenville is shown carrying his favourite Childs Coffin, Miss Americ Stamp, who was born in 1763 and died hard in 1766.
The average menstrual cycle is 28 days long. However, a normal cycle can be shorter or longer than this. It may be anywhere from 21 to 35 days long. Most periods last 3 to 5 days, but anywhere from 2 to 7 days is normal.
The answer to your question depends partly on how regular your period is. If you get it like clockwork (very few women do, actually) then a couple of days late might be cause for concern. On the other hand, if your period varies from month to month, then you will have to wait longer. The time from ovulation to period is a stable 13-15 days, while the first half is where the variability is.