Hi,
Thanks for the query.

Fluctuation in features of menstrual cycle can occur due to many factors which can influence the hormones.
The possible causes for your light periods are:
Hypomenorrhea: means scanty flow during periods, it can be seen in conditions like anemia, poly cystic ovary disease, thyroid disorders, weight changes, recent illness, stress and strain etc.
Pregnancy: as urine pregnancy test kits may not detect early pregnancy sometimes you can go for blood test for pregnancy which will rule out the possibility.

If test comes negative the symptoms you had could be part of premenstrual syndrome. If they repeat in next cycle better to get investigated once to find out the actual cause of your problem and take treatment accordingly.
Hope I have answered your query. I will be available to answer your follow up queries. If you are satisfied with all my answer, please rate the answer after closing the discussion.
Take care.

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