I'm getting my period regular but total days of period has decreased. Usually my total number of days are 6-7, but last two times it became only 3 days and also it's not getting cleared as before. The 1st day of period, I noticed brown colour blood at starting along with lower abdominal pain. Two to three weeks before starting of my days, I feel heavy lower back pain and leg pain with headache. I'm worried about this sudden change, please suggest a remedy. Thank you