I don't know much...I am very young.. Very...Very young...But I think I can help. First I have some questions. Are your periods normally short, and are they normally light.. Also, are you very stressed and worried about being pregnant, if so that may cause things to change during your period. :shock: I am also afraid of being pregnant. And I am as well getting back pains, but that may also be from a regular period, if you don't normally get back pains from a period, that may also be caused by stress. Good luck.. And try to be more detailed on your situation. I do hope I helped some.