IUD or Implanon?

Me and hubby are in our early 20s. Alrdy got 2 kids. 3 year old girl and 6 month old boy. We are contented that we're bless with a pair. If can, I want to stop at 2 and focus on raising my 2 kids and give them the best life that I've never had. I wanna return to the workforce. Hubby also agree tbat we are not ready for #3 yet. How do I go about to take the birth control? Payable thru medisave or no?