Yes it is possible. It could just be an odd month where you have 2 periods this month and next month you are a week late. If you notice that you have had 3 periods or more that are off then I would encourage you to speak with your doctor you may need medication to regulate it again. For now I wouldn't stress over it.
It really depends on what is going on in your life. If its just a one off then I don;t see an issue with it, however it becomes a continual thing then no.