Some fibers from the ventral cochlear nucleus cross the midline in the trapezoid body. Thus, cells in the superior olive receive inputs from both ears and are the first place in the central auditory system where binaural processing (stereo hearing) is possible. The output of the superior olive travels in the lateral lemniscus.
Delay caused by a short stress time is usually a week or two, then you ovulate normally. However, under continued stress (heavy exercise, malnutrition, etc.) you can be anovulatory for a very long time. If you are having problems in this area, have a look at this book: Fertility, Cycles & Nutrition 4th Edition.
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.