late period or pregnancy????

Okay so I'm 17 I started my period June 30th it lasted 6 days and then I had a sexual encounter on July 7th and I took a plan B in case then on July 13th I bled from the plan b that lasted 7 days and I'm normally am like 28 to 30 days between cycles and all so on August 5th I had sex again and I don't know if I was ovulating or not (yes he did ejaculate in me of course) so here we are Aug 13th and I'm not sure what to do or if I'm overreacting/parnoid I will get a test just to be sure I'm not but I figured I'd come here and ask yall for some advice and to see y'alls opinion on the situation