I found I had stringy mucus too. It was blood tinged, sometimes like a light period, other times like pink mucus. I had a 7 week long light period, then nothing for a few weeks, and then light period for two weeks, every two weeks. Drove me nuts. So after 5 months I had it removed. Periods returned to normal.

The one thing to watch out for with implanon, and this doesn't happen to the majority, is depression. If you have a family history, or are prone to depression, the implanon can give you depression. I did not know this until I had mine removed and my depression suddenly went away. That is when my doctors (mental health) told me that the implanon caused it. So just keep an eye on how you're feeling ok.