Why did my period come back after only half a month?

Patient's question:

Okay, here is the translation following your instructions:
A little bit more, dark blood, doesn't really seem like menstruation either. I went to the swimming pool to swim yesterday, which counts as vigorous exercise. Is it alright?
Onset time and cause of illness:
Treatment situation:
Help desired:
Is this considered vaginal bleeding? It doesn't seem like menstruation, just a little bit.

Doctor's answer:

Hello, this is a symptom of menstrual irregularity. The basic symptoms of menstrual irregularity are as follows:
1. Early Menstruation
Early menstruation refers to a shortened menstrual cycle, less than 21 days, and occurring consecutively for two or more cycles. It is a type of ovulatory dysfunctional uterine bleeding with biphasic basal body temperature. The follicular phase is short, lasting only 7–8 days; or the luteal phase is shorter than 10 days, or the temperature rise is less than 0.5°C.
2. Delayed Menstruation
Menstruation is delayed by more than 7 days, or it occurs every 40–50 days, and this happens consecutively for two or more menstrual cycles. In ovulatory cases, there is biphasic basal body temperature, but the follicular phase is long, and the high-temperature phase is low. In anovulatory cases, there is monophasic basal body temperature.
3. Extended Menstruation
The menstrual cycle is normal, but the period extends beyond 7 days, or it takes up to two weeks to subside. In cases of inflammation, there is lower abdominal pain at ordinary times, which worsens during menstruation. There is also excessive leukorrhea, with a yellow or yellowish-white color, viscous texture, and a foul odor. In cases of incomplete luteal regression, there is excessive menstrual bleeding. In cases of prolonged endometrial repair, there is still a small amount of persistent vaginal bleeding after the normal menstrual period.
4. Irregular Menstruation
There is also irregular menstruation, where the period either comes early or is delayed, with cycles shorter than 21 days or longer than 35 days.

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