"I had Nexplanon inserted in December 2014 after giving birth to my first child in October 2014.  The first couple of months were rocky.  Off and on periods.  One day I was fine, the next I would bleed.  Mostly light bleeding but some heavy.  Now, October 2015, I have not have any spotting or bleeding a since April (AT LEAST) and all of the sudden I start bleeding today.  I have had bad weight gain with this method.  And call me crazy (but I know a couple others  that have experienced this as well)....I feel pregnancy symptoms sometimes.  I have actually felt what feels like movement as if I am pregnant and the baby is kicking.  Weird.  Nausea.  Horrible headaches.  I am considering switching to another method.  I have tried pill and Depo."