"my doctor recommended nexplanon after i got pregnant while on nuvaring, but later miscarried. the first few months were great, the first month i had a normal period and then none yay!  month 4 brought on a pain in my right lower abdomen that was terrible along with bleeding black blood.  my pcp was out so i ended up at a walk in clinic where i found out this lovely birth control caused ovarian cysts. one had ruptured leading to the bleeding the other needed to be removed surgically.  apparently this is a very common side effect."