Birth control

So I've recently got the implanon inserted about 5 months ago. I'm extremely aware of all the side effects and I haven't gotten anything too bad, as it's different for everybody but  I have a question. When I get my period now it's like super dark and like clott-Y. It just looks like really dark and nasty as if I didn't change out for like three days(over exaggeration) I don't know if it's normal or not. 
Any of you on the implant get this?