symptoms

back story i normally have a 24 day cycle bleed for 4 days I last had a heavy cycle on the 22nd June but on the 5th July I had what I think is a light period it was a small amount if red blood a lot less then my average cycle my fertile window was around 10th July I had sex on 10th yesterday and today I have had this discharge I have also had mild cramping and hot flushes does anyone know what this could be pleas