How do i tell if i am experiencing vaginal bleeding or just my period?

By Calender: Periods come every month.Most people have 28 to 30 days cycle.And periods are associated with other changes like sore breasts,cramps in lower abdomen.Pelvic pressure,food cravings,mood swings,irritability,backache,water retention,headache and fatigue.Not all women get all symptoms but some symptoms they get every months.And it lasts 3to5 days Vaginal Bleeding can happen in between the periods.