I used the ovulation calculator to calculate my ovulation period last month and i had sex all through the ovulating period calculated,i then missed my period for last month which was meant to come on August 22 but i noticed plenty and watery vaginal discharge few days after the missed period date then cramps a week later,to my surprise now,ive been seeing blood for like 2days now which is 3weeks late of my missed period,pls what can be the cause of this,can it mean am not pregnant,or what is the meaning of this.tnks and i'll appreciate your quick response