I'm going through the same thing right now! And I wasnt even suppose to start until like a week later, is your period a lot heavier and tons of CM (cervical mucous) like its all mucous but all red? Are you getting lot of cramps that are stronger and duller also? That is exactly what I'm going through right now and from what I hear out there, we just may be experiencing a chemical pregnancy you can google it just type in the search engine "chemical pregnancy".. I think that is what is going on with me.. I'm going to be seeing a doctor soon you should do the same.. Hope this helped!