Brown discharge

July 6, nilabasan po ako nang brown discharge, akala ko po mens na ang kasunod pro after ko magpalit nang panty, wala nang sumunod na dugo or khit brown discharge, spotting lang po sya na watery. Last mens ko is June 18-20 na dapat 5 days. Nag umprotected sex din po kami nang July 4. Ano po kaya pwedeng reason bat may ganon na lumabas sakin? Any comments po will be appreciated. Thankyouuu 😊