Stain on diaphragm
Thank you for your question.
Because a diaphragm is inserted into the vaginal canal, any stain found on it is treated like a stain on a bedikah and we do NOT apply the leniencies of stains found externally. Therefore, regardless of size, if the color is problematic, you would be a niddah. The stain needs to be shown to a rabbi either directly or through a yoetzet.
For the future, it is a good idea not to look down until you have finished cleaning the diaphragm and rinsing out the sink.
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