20 days late for period can anyone relate??

Hello my menstrual cycles are usually 29-30 days average length. This is very strange because last month i didnt think i would be late i kept and still am having pms sypmtoms! Cramps on and off,boobs keep growing bigger im up a cup size,mood swings the usual. I tested at 6 days late negative result and again at 9 days late negative. So im like ok my period is coming keep feeling pms and each day nothing it's all clear not even spotting! So went to doctor at 16 days late i was ''2 weeks late'' for my period by then... they took blood,pap smear, i got a pelvic exam doctor said everything felt normal and that i should get my period in a few days. The next day got my results blood test negative, everthing came back normal but he did see mild flucuation in my hormone level but he said that was due to stress! He said in 2 weeks if my period doesnt come he will give me medicine to bring it on. Currently still waiting for af where is she is she on vacation?? i keep feeling like it;s coming but everyday nothing!! For some reason im thinking about testing for pregnancy again my boobs keep growing why is this if everything is normal??? i havent been stressed either lately. Do you think i should test again or wait?? And has anyone been through this and found out they was pregnant