Had copper iud inserted 3 weeks ago. In the last week I’ve had progressively increasing dark brown black spotting using up to 2 liners a day. Today it seems my period has started although is very light (using 2-3 light pads). I have no abdominal cramping only lower back. Has anyone else's cycle started off like this? Should it get heavier? Would appreciate all advice and experiences as if trying to determine if this even is my period.. thanks