I usually get my period on the last week of each month, and it's been pretty consistent each year.  Up until this month.  I haven't gotten my period yet, and my last period stared on Sept. 24th, and it's Oct. 31st already.  Towards the middle of this month, I had what I thought was a period, but it was really light and only lasted for a couple hours.  Could I be pregnant?  Please help!