Hi, and thanks for your medical question on eHealth forum!
If you had your periods just 3 weeks ago and now have lower abdomen cramps (twinges) and headaches, then it could either be due to infection in the vagina or pelvic inflammatory disease or due to some bowel problem like IBS or it can also be a part of premenstrual syndrome. There is also a chance that you are pregnant.
However, nothing can be confirmed before the due date. Please consult your gynecologist regarding this as a confirmed diagnosis to your problem and treatment for it cannot be prescribed on net without examining you. Hope this helps. Take care!
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