Ok so I had unprotected sex in the beginning of Sept I got my period on the 20th of Sept it was some what normal then in the beginning of Oct and the something happened with my period then but it started on the 18th like glow said so this month glow said my period was to come on the 15th and nothing happened so I tried another site and it said anywhere from the 15th to the 17th I have no signs or symptoms of my period and I have had regular periods since I had my son 7yrs ago any insight would be greatly appreciated