You don't need a contaeception method while you are pregnant because you will not be able to get pregnant
No, it does not stop pregnancy. You are still at risk if you do not use contraception.
While you are pregnant you do not have periods at all.
Yes, appetite increase while you are pregnant
No you don't ovulate while pregnant so there's no egg to fertilize.
yes you can still get preggers while on the monthly
It is extremely rare to get pregnant on the contraceptive implant. It is one of the most effective methods of reversible contraception. If you are on the implant and bleeding, it is very unlikely that you're pregnant.
Yes but not for a long period of time
If you have not missed any pills in your cycle the BCP is 99.5% effective. While conception is always possible when you have sex - the odds are in your favor that you will not get pregnant. If you have missed any "active" BCP in the last week see the information at the link regarding Emergency Contraception. If you have not missed any "active" pills, Emergency Contraception is not needed, nor is it recommended.
no cause you dont get a period while pregnant
I have to wonder why you'd want to get pregnant whilst taking hormonal contraception. If you're actively trying to get pregnant, ceasing to have the injection would be a step in the right direction.
It can take months for your periods get back to normal, especially if you are breast feeding you can miss periods or have long times between them. You can still get pregnant while breast feeding and having irregular periods though so you should still use contraception.