ok im 22 years old and im on birth control my period came a week early and so far has lasted a week long. at first it was like a normal period for about 2 days not too heavy but not light either. then it stopped for a day then started again really light and ive been getting pain in my abdomen and lower back like cramps but not the same. it only seems to really start at all at night bt during the day it pretty much stops and i only spot a lil bit. im really confused because normally my period only lasts 3-4 days and it has now been 7 and im still in pain. i just want to know if anything could be wrong