Period started 3 days early this month. Lasted normal 7 days. Now I have backache, chills, headache and a bloating/light cramping feeling. Cause?

Primary care eval. Backache, chills, headache and bloating do not seem to be symptoms that would be related to your period that already has stopped. Consider scheduling a visit with a primary care doctor here on Healthtap to help sort out this list of symptoms and try to narrow down and focus the evaluation.