help a girl out!!

okay so. here’s the tea. i had sex about 2 or 3 weeks ago with my current boyfriend and a few weeks before that and i’m 2 days late on my period. i’m a very paranoid person so i took a pregnancy test and it came back negative. i’ve been stressing about missing my period for the past 3 days because i usually start my period like a week early! and i’m freaking out right now and the only reason i can think i missed my period is bc of lack of sleep and the stress. i’ve had all my period symptoms and no pregnancy symptoms and idk what to do or what any of this means