Irregular periods with and without Implanon

[Lollirot]

This is possibly tmi so apologies in advance!

I had an Implanon implant put in in Feb of 2014. I put up with it for over a year but found it made my periods irregular to the point where I had more days on a period than I did off. I had it removed on Wednesday just gone, the 10 days prior I had bled heavily. Today, I've started another heavy and painful period. Has anyone else experienced this with Implanon?

I've taken pregnancy tests as I was concerned that this could be signs of a miscarriage but they were all negative.