No data was provided about whether you had intercourse in the time period you are asking about. If you had sexual intercourse around the 27th of October when you were supposed to ovulate, then you might be experiencing implantation bleeding. Implantation bleeding occurs when the embryo embeds in the uterine wall by slightly damaging the mucosa which causes very light bleeding (usually spots) that does not last for longer than a couple of days. The implantation bleeding occurs when the embryo embeds, which is approximately 4 to maximum 7 days after intercourse.
If there was no intercourse, then you might be experiencing a hormonal imbalance that needs additional examination in order to determine its cause.
You might want to visit your gynecologist for a physical examination, hormonal laboratory tests and ultrasound scan. In the end, the hormonal imbalance might be temporary and just a variation of your regular hormone production pattern, but visiting a gynecologist would be a good idea just to be on the safe side.
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