My girlfriend wants me to finish in her. she has the depo provera shot, and shes had it for 3 months now but i need to know if its safe to finish without a condom inside her?

When the shot is administered on time, it is over 99% effective. But in real life, the shot is approximately 94% effective, since people don't always get their shots on time.

You will both feel safer by using condoms every single time, "whether it is to begin or to finish inside her" . You will therefore reassure each other and increase your protection and hers. Do encourage her to get her depo-provera regularly every 3 months .