I just had my period one week ago and now i am bleeding again. why is that?

Abnormal bleeding: Is this a new problem or have you been having abnormal bleeding for a few months time now? This could be related to any of a number of issues such as polyps, fibroids, ovulation problems, infection, etc. You should be seen by an obgyn physician near you for a full exam, pap smear, cultures and possibly an ultrasound or blood work.