I am 41 years old, unmarried, female, with vitamin d deficiency since a month. Taking vitamin d medicine and ciplar la20 for anxiety. But after my last month period, which was delayed by 4 days and after it ends of 3-4 days, I had small brown-black discharge daily which lasts for one week, at times with cramp or no cramp. Now it stops discharging and cramping. What does this mean? If this happen again, is any cause of worry? Or normal phenomenon?