You can get pregnant if you get fingered but only if the finger had sperm on the finger to fertilize the woman's egg.
Without sperm entering the vagina there's no way to get pregnant.
Just like you can take a turkey baster and put sperm into the turkey baster and if that sperm is fertile then the woman can get pregnant through the turkey baster.
But without the sperm no pregnancy can happen.
It takes sperm and the woman's eggs to fertilize and attach themselves to each other to create a baby and make a woman pregnant.
Just getting fingered by a guy without any sperm on their finger will not get a woman pregnant.
I've been fingered several times when I was younger and never gotten pregnant.
It was not until I had actual sex with my husband before I got pregnant with my kids.