pregnant or not

so me and my boyfriend been dating for a while and we did the dirty and didn’t pull out on the 23rd of august so i took a plan b the 24th at 10am ish then i started bleeding the 31st of august to the 5th of september then i took a pregnancy test on the 9th of september and showed up negative. am i okay? or did i do the test too early or when am i supposed to get my next period. my last last period was the 15th of august to the 20th and my next actual period is suppose to be this week and i’m stressing! help! (5 days late for period sept, 20)