I had the implant on since December 5, 2012, this year in a couple of months I need to remove it or replace it. My periods always last 7-8 days. I had my period on a Monday, had unprotected sex Tuesday (my boyfriend release inside me) period stop the next day. It's been a week and I have been feeling nauseous and having lowing abdominal pain out of no where (comes and goes) I know it's silly to ask, but I'm curious. I know it's 99.9 effective, I just want to be sure.