hi, my name is Julia, 22 yrs old. i'm 155 cm height n' 45 kg weight. my last period of mens was on July 27 and til today i het my mens postponed

i had sex at Aug 7 and i've taken pregnancy test w/ 2 different brand testpacks, 3 times in the last 1 week and the results r all negative. in the last 4 weeks, i've got busier w/ my work n' sometimes need 2 take a long trip 2 another city. i've taken common pills 2 overcome my mens postponement, one was Regumen. can u suggest me what should i do?

thank you