I have my implanon for over 4 mos now and this month I've been bleeding for almost 1 month! I just remember two days I didn't have my period, what shldo?

Pregnancy test. All contraceptive devices are not perfect, and will therefore not provide anyone with a full 100% guarantee protection from pregnancy. There are many reasons why you may be bleeding and difficult to go into details here. Please do a home pregnancy test because pregnancy (believe it or not) can cause bleeding. See the doctor who have placed the implanon.
See ur doc. Implanon is notorious for causing this. See your doc and it may give you some pills that possibly will solve your problem.