What are the reasons for the flow of purplish-red liquid after sexual activity?

Patient's question:

Hello everyone,
I have a friend who had her period on the 1st of this month. On the 9th, she had sexual activity. However, on the 15th, she noticed a purplish-red liquid coming out of her vagina, along with red and black liquids, similar to her period. What could be going on? Is this a symptom of pregnancy in the first month?
I’m very eager for a response. I’m waiting online.
Thank you, doctors!

Doctor's answer:

It could be ovulation bleeding. Ovulation occurs around 14 days before menstruation, but in most people, there is no such phenomenon as ovulation bleeding. However, you don't need to worry—this is also a physiological phenomenon. Due to individual differences, only a very small number of people experience ovulation bleeding. If it lasts only for a couple of days and the bleeding is minimal, with no significant impact on daily life, there's no need to be too concerned.
Clinical manifestations of ovulation bleeding: Ovulation bleeding, also known as mid-cycle bleeding, refers to light bleeding between two normal menstrual periods, which may be accompanied by varying degrees of mild abdominal pain.

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