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.
There are several causes of an early period. It could be stress, changes in your lifestyles, or a hormonal imbalance triggering menorrhagia along with irregular cycles. Although the average cycle is 28 days, it is perfectly normal to have a cycle that is as short as 21 days or as long as 35 days. You do not state your age. If you are a teen or a woman in her 40's, you may have a cycle that change a lot due to hormone imbalance problems.