There are many women who can set a clock by their monthly menstrual cycle. The menstrual cycle usually occurs at the same time every month. The uterus will prepare for an egg to be released from the ovaries by thickening the endometrial lining. If the egg isn’t fertilized, the lining will then shed through menstruation. When this cycle doesn’t begin as normal, it can be a frightening experience. There are many reasons for a menstrual cycle to be late, and sometimes it can be a serious medical problem.
Pregnancy
Women who are late beginning menstruation and are sexually active could possibly be pregnant. If this is a possibility, a simple way to find out for sure is to purchase a home pregnancy kit. These tests are generally very accurate, and some are very inexpensive. They work by testing for the pregnancy hormone. If these tests have been taken and the answer is still unclear, a doctor can take blood and test for pregnancy. Blood tests are a guaranteed way to check for pregnancy.
Medical Problems
There are many medical conditions that can cause a late period. Menopause can cause a late period, an absence of a period or extremely heavy periods that last a long time. Polycystic ovarian syndrome can also be the cause of late menstruation. Some sexually transmitted diseases can be responsible for a late period, such as chlamydia or syphilis. Any time there is a change in the level of hormones in a woman’s body, the menstrual cycle can be affected. A significant change in diet or exercise routine can also cause a late menstrual cycle, according to Medline Plus.
Change of Birth Control
It is possible for a change in birth control to cause the menstrual cycle to be late or absent. Hormonal birth control is strong enough to keep the menstrual cycle from beginning as normal, but as soon as the birth control is stopped the cycle will return. The American Pregnancy Association explains that women who take active birth control pills or use the patches without taking a break can miss their menstrual cycles completely.
Delayed Ovulation
A woman’s menstrual cycle occurs because of ovulation. When ovulation is delayed, the period will begin much later than normal. Merck Manuals states that ovulation is usually on time each month and lasts around 14 days. Some things that can affect this normal cycle can be lifestyle changes such as sleeping habits or stress.


