I am about 5 weeks post removal and I started my period 2 days after removal. It too was very heavy and had lots of nasty clots. Based on my experience I would say that what you are experiencing is normal. I haven't had a second period yet, but I am expecting one any day now. Off and on for the past week I have been experiencing random bouts of cramps and pressure and some general pain in my pelvis. I am hoping it is just due to a period that is on its way.