when your supposed to start on the 20th of this month you should take your test if it comes out negative go to your doctor and ask for a pregnancy blood test,,and yes it sure does sound like your pregnant,,good luck
Normally a hpt would definetly show if you were pregnant normally it shows as soon as you missed your period I would say you did not get pregnant at least not on that cycle...maybe you were under stress and it made your AF to be odd...good luck
If you have taken hpt after your expected period and it came out negative, then you are most likely not pregnant. You probably just had a weird period. I would be careful just in case and take another test if you miss your next period.