Brown discharge between period

About a week after my period I started having brown discharge.  Sometimes it looks like a light blood flow, but later returns to a darker brown color.  It seems to get worse after intercourse with my husband.  After intercourse it also looks more like blood- more of a brownish red.  Looks like end of the period blood.  At the end of the day , like I said , goes back to darker brown.  I am not in pain, no cramping, no itching and no discomfort.  I have never had anything like this before in my 33 years ( also having 2 children).  Please give me a clue what this could be- I am worried!                                           Thank you,                                            worried

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