It could be like Poppy said, that you are so stressed it is delaying your period (it has happened to me before). I don't want to give anyone false hope but have you ruled out implantation bleeding? From everything I've read (and someone correct me if I'm wrong) it can occur anywhere from a week before your period to just a few days prior and is generally very light and either pinkish or brownish in color. If the

doesn't show up soon I'd take a HPT just to be sure.
