If you had sex you had intercourse, meaning a boys penis was inside your vagina and some semen was left in your vagina. It does not make a difference how far his penis penetrated you. If his penis was inside your vaginal opening even if he did not pump you had intercourse and you are no longer a virgin by today's definition. Once a penis has penetrated a vagina to any degree carnal knowledge is conceded to have taken place and virginity is lost.
If he ejaculated while his penis was inside you like this then enough sperm was shot into you to make you pregnant if all other factors were right.
You say you took the 72 hour pill. I believe you mean you took the Plan B pill within 17 hours of the possible intercourse. If so the chances are that the plan B pill will be successful in preventing a pregnancy. Go back to the drugstore and purchase a home test kit. Follow the directions on how long to wait after intercourse happened as to when to test. Then test for pregnancy.
Regardless of whether you get a negative or positive reading wait 10 days and test again to see if you get the same reading. This will insure that you did not get a false reading. If your period shows up before you have a chance to test the second test you are not pregnant. [ adviceman49's advice column | Ask adviceman49 A Question ]
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