I had the Implanon for 3 years. Had it taken out and a new one put in 3 months ago. I had protected sex during the limbo time (the week when the old Implanon was out &before they put the new one in)& unprotected sex after the new one was put in ... I know how unlikely it is to get pregnant while on Implanon... but it still worries me because I've been having period symptoms last month and this month but no actual period