im not on birth control at all

Im a 16 year old female, and this was not my first time having sex, ...

ok soo on may 30th at 9:30pm i had unprotected sex with a friend, he never pulled out....im not on birth control at all. four hours later i got my period, so i thought i was ok, but it only lasted 4 days, which is WAYY less then usual, i looked on google and it said that sperm can live up to 5-6 days in a woman even on her period, and it also said that a woman is most fetile rite before AND after her period...but i need help ASAP!!!

is there a high chance im pregnant? and if so how do i get the test done? are there symptoms i should look for?

HELP!!!!