my period come December 1,2,3,4, again its come...

yes you can say its normal 
A period that comes every cycle at exactly the same time is not the
norm. 
 Most likely your periods and cycles will become more regular as you grow older. But having a regular period usually means that your periods come roughly the same number of days apart, and last roughly the same number of days.
Menstrual flow might occur every 21 to 35 days and last two to seven days
  if you havethe following you should visit your doctors

• Heavy menstrual flow (menorrhagia)

• Nausea/Vomiting

• Gassiness

• Diarrhea

• Painful bowel movements or urination

• Chronic pelvic pain

• Leg Pain (neuropathy)

• Headaches or Migraines

• Fatigue