What situations can lead to spotting?

Patient's question:

I have an itchy lower body, and my underwear is always yellow. What's going on? What situations can cause bleeding?

Doctor's answer:

Here are the translations for the provided text:
"See red is one of the three signs of labor. If you are close to your due date, the uterine blood vessels may slightly shorten or expand, which could cause some bleeding from the vagina, indicating that delivery might be imminent. You can undergo tubal recanalization surgery at a secondary or tertiary hospital in the gynecology or surgery department, requiring proof from the local family planning committee or neighborhood committee. The highest chance of pregnancy occurs three days before and one day after ovulation when having intercourse."
(Note: The line breaks and quotation marks are preserved as per the original text.)

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