I am female,26. Mommy for a child age 2 year female. My problem is, past 2 weeks in a row I have irregular periods, means not smooth as usual. Its shows dark brownish and red color combinations and it show not irregular. Some time is there on my pad and sometimes is clean and sometime in very dark brown in color. I have put IUD for 5 years, now is my secound year for IUD. This is my first time happening to me. I dont have any allergic or abnormal harmon. Why its happening doctor. ?