Welcome to HCM,
What ever description is given by you,I presume it was not a ejaculation inside vagina, but sperms travelling through fingers is very less likely though not impossible.Pregnancy
also depends on when all this took place she was in fertile period of her cycle that is 14 days prior to expected date.
Now what you can do if it is with in 48 to 72 hours you can give her emergency contraceptive
pills,if time has already passed then wait for her period to come if it is delayed then take a urine pregnancy test and further action depends on result of test then consult a good Gynecologist.
Please practice safe sex
, as it not only prevents unwanted pregnancy it also protects you from Sexually transmitted diseases to both.
Please take care
Best of Luck