I have a situation that seems to happen almost every month. My menstrual bleeding clearly ends, but for the next two or three days I sometimes continue to have cream or brown-colored discharge. It looks like normal clear discharge mixed with old blood rather than fresh bleeding, and it is never bright red.

This only started after I began taking birth control pills. Before taking them, I did not have this problem.

I sometimes find dark brown discharge on bedikot, or find dark brown stains larger than a dime on my white underwear. If these brown stains are considered niddah every time, it would mean that I would have to wait about 6–7 days after my menstrual bleeding has already stopped before I could even begin counting my shiva nekiyim almost every month.

I have read that women who experience recurrent staining are sometimes advised to wear colored underwear during Shiva Nekiyim so that every stain does not become a halachic concern. Is this correct? If so, would this guidance apply in my situation?

Thank you very much.