Welcome to e health forum.
The effects you have are normal effects seen with long term use of Implanted progesterone contraceptive methods including implanon.
Irregular bleeding is the most common side effect, especially in the first 6-12 months of use.
For most women, periods become fewer and lighter. After one year, 1 out of 3 women who use Implanon will stop having periods completely.
Some women have longer, heavier periods, while others can have increased spotting and light bleeding between periods.
These side effects are completely normal but may cause confusion about a possible pregnancy. But when Implanon is used correctly, it is very effective and will prevent pregnancy.
If you are concerned about a possible pregnancy, you can always take a pregnancy test, which will clear all your doubts.
I hope this helps.