Immediatly after period

My fiance and i were playing around the other day ...it was the day after i have finished my period he didn't put his thing inside (we just don't want me to get pregnant befor the wedding it's not cool in our culture ) i am still virgin   and it all was around my Vulva .He ejaculated  outside then he had a shower and after maybe half an hour we got back to that again .. Is it possible that some sperms might have been still there and can get inside of me just by putting his thing around the vulva the second time ? Is the any possibility i can get pregensnt ? Help me please .