Unusual CM during menstruation – third month off birth control.

Patient: Stopped pill (microlite) due to spotting. Spotting stopped, periods came as normal but heavy. Noticed a lump of dark green-streaked CM during 3rd day of menstruation (which only appeared once). Should I be concerned? I’ve been experiencing withdrawal symptoms from pill – breast tenderness, mood swings, acne etc.

Symptoms: Breast tenderness, heavy period, mood swing, CM.