You have been quite elaborate about your description but have failed to mention when exactly ypu have your unprotected sexual encounter.
Anyway, if this took place when you were not on contraception
but your partner used the withdrawal method or did not ejaculate at all, then the chances of pregnancy
do come down; but I would advice a pregnancy test as you have not disclosed much. This will have to be conducted at least 2 weeks after the date of sexual contact or on or after the first day of a missed period.
If this took place while you were on your contraception aling with the fact that your partner did not ejaculate inside you, chances of pregnancy are slim to nothing. If you do not get your next period on time, please go ahead with a pregnancy test using the above mentioned instructions.