Best contraception

I am done with having kids. I have 3 and my last has spinabifida so has loads of extra needs so i really dont want anymore. My problem is i used the implant for 6 years before my last and i bled constantly! After i had my last i have been using the contraceptive pill and again i bleed ALL the time. Not constantly like the implant but an example of my period is i will bleed for a week then come off and then 5 days later another whole week period and so on! I need advise on what i can do where i wont just bleed all the time! Thanks x