Thank you very much for the responses! I guess my question is what if she starts her pill next pack of pills late? I know there's still a chance but if it's after her period isn't she less fertile?
It's unlikely! however sperm can live for 72 hours! so it's always a risk. The oral contraceptive pill prevents ovulation, so you should be fine. If this is a point of concern to you, talk to your doctor about Implanon
The birth control stops you from ovulating. You're protected on the pill without a condom, in fact many women don't use condoms when on the pill. But using condoms is extra protection which is advisable if you want to be safe. A lot of my friends don't use condoms while on the pill and they have not been pregnant. I still think it's better to use condoms too unless you're in a position where you could afford an accident.