Sperms can stay viable for few hours on surfaces like skin. If the finger was wet with semen and the same was used for fingering the vagina, there is a remote chance of you getting
pregnant if this incidence has occured on day of ovulation (any day between day 10 to day 17 of cycle)
Next Steps
Take emergency contraceptive pill within 72 hours of the act if you fill such an incident has occured. If you miss your periods, do a Urine
pregnancy test and consult gynaecologist accordingly.
Health Tips
Do not involve in risky behavior, if you don't want pregnancy any time soon. :)