HELP COULD I BE PREGANt?

Danielle
Hi there so heres the story:
Im am 18 years old about to graduate high school, on may 13 i had sex for the first time around 7:00pm i really didnt want to and it was more of peer pressure and a one night stand he didnt ejaculate inside me, because i didnt even let him put in all the Way inside because i was scared so after that i told him to stop and so he did after that i started ro read about precum and how they dont feel it so i got nervous and went and bought plan b around 9:00 am (sorry if its tmi) anyways after taking plan b a week later may 19 i had a light/regular period you could say lasted around 4-5 days it was 2 weeks before my expected period, after that i went to the gynecologist and explained to her what happened she told me i wasn't pregnant because of the pregnancy test they did which made me feel better but i still think that maybe it was a little too early to know?, but now june 1st i havent seem my period im about 4 days late i believe and im am freaking out!!!!! When am i supposed to get my period!!!????? i had some weird symptoms like lower back pain, some really mild breast soareness, mild nausea and huge cramps have anyone whos taken  plan b had these kind of symptoms!???? When is my period supposed to come !??? Why do i have these symptoms like if i was pregnant!???? could i be pregnant please
Your comments and responds would be extremely helpful thank you sm! God bless