Stain after stopping birth control pills

Hello, I wanted to ask: a woman who, after childbirth (second birth), took birth control pills (Cerazette) and stopped taking them three weeks ago (after taking them for a year and a half) and now saw a stain (a very small dot) on a tissue, and also feels pain. The question is whether there is a rule of abstaining close to menstruation in such a situation (there is no regular cycle)? Thank you in advance.

Hello 

A stain smaller than a 'gris' [= like a two-shekel coin] does not render impure. 

However, due to the pain, one should wait a few hours before permitting, to ensure it is not the beginning of menstruation.  

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