Dear Nikkie,
There are a number of possiblities which would explain your symptoms.
Was your period late when it started? If so, then a miscarriage may be possible. Usually, though, a miscarriage will be accompanied by more bleeding and cramping, but if it is early enough, perhaps not.
You may have had a cycle without an ovulation, or with a poor ovulation. This would result in either no progesterone (no ovulation) or inadequate progesterone (poor ovulation) produced in the latter half of your cycle. Without normal progesterone, your period will be abnormal. It may be accompanied by premenstrual spotting, post-menstrual spotting, and/or more cramping/bleeding than usual.
An ectopic pregnancy always should be considered any time you have an unusual period (especially a late one) accompanied by unusual pelvic pain. A pregnancy test can help exclude this. Any pelvic pain that is persistent and progressive should be evaluated right away.
The discomfort you felt ten days after your bleeding stopped could have been ovulation pains associated with the next cycle. These are called “mittelschmerz” pains, and are common with ovulation.
The fatigue you feel could be due to many different things, many unrelated to your menstrual cycles. Low progesterone could be playing a role here, though. The only way to test this is to check a series of progesterone levels targeted to your ovulation. If you find that you have more cycles like the one you described, then it may be worthwhile for you to chart your cycles using the Creighton Model NFP charting system, then have progesterone levels drawn on the 3rd, 5th, 7th, 9th, and 11th days following you peak mucus day. This will tell you if you would benefit from progesterone supplementation.
Dr. John Gisla