Could not having a period mean I have secondary amenorrhea?
Yes. By definition, amenorrhea is the absence of your periods. It can be divided up into two categories. Primary amenorrhea is when a woman has never had a period and is past the age where periods would normally be expected to have begun. Secondary amenorrhea is the term used for women who have had periods previously but then stopped.
There are many causes for secondary amenorrhea. The most common are problems which have resulted in ovulation stopping. Problems with the uterus such as scarring inside the uterine cavity can also result in amenorrhea. The first thing a woman with secondary amenorrhea must be test for is pregnancy.