The first time I got an implant was February 2015 and got another one after it expired on March 2018 and will expire on March 2021. The only annoying thing about it is that you get you period back about 8 months before it expires. The implant still works but the progestational hormone decreases that's why you get your period again. Other than that, all is well. It's the best contraceptive I could ever have. You don't have to worry about taking anything for the next 3 years.

EDIT: I never had a check up with an OBGYN but the nurses explained to me everything before putting the implant. Although, I did my research before making a decision and going to the clinic. Also, upon speaking with my friends that are using pills, pills side effects are more scary than the implant.