Hello everyone. 5-6 weeks. I did a blood test on September 1st, result…

Hello everyone. 5-6 weeks. I did a blood test on September 1st, result: 1051. Nothing worried me, just felt a little low in my abdomen but there were no discharge. They said the uterus is stretching, nothing serious. Today and yesterday evening on panty liner it was 2 brown drops. Today also, nothing now. What could be the reason? 2 days ago I had a Mirena insertion with wax. Could that be the reason? I have an appointment for ultrasound and consultation only on Monday. I am worried right now.