Could i get pregnant if he ejaculates on my thigh and then i touch it and rub it on my vaginal opening?

Doubt it: I suppose "anything is possible" but that sound very unlikely. Good wishes.

Yes: If semen was brought into contact near the vaginal opening (introitus) then then is a small but possible chance of pregnancy. Please talk to your doctor to review effective methods/options of preventing pregnancy if you are not on birth control already and remember that only barrier methods (condoms) can prevent the transmission of STDs. You should also get a follow-up pregnancy test.

Almost zero odd ...: The reported scenario should pose an almost zero odd to conceive in considering the high fastidious requirements for sperms to survive & swim. Nonetheless, always do HPT one week after missing expected period and repeat it in another wk if the first HPT is (-) & still in doubt. More? Seek evaluation and counseling so to ease current concern and to prevent future worry.