You can sure get pregnant if a guy ejaculates on your vagina. After your sexual partner has shot cum, and he fingers you, it might be possible that he caught some sperm on your vagina. But I would say the chances are low. It depends how long the sperm was on your vagina. That's all I can say. Good luck.

I say "yes"

the chances are very slim indeed but if you dont want kids then i would avoid any sperm touching the vaginal area as slim chances are still possible ones.