Help confused !!

So like is it possible to take pregnancy test and get negatives and 2 weeks later still have symptoms?? I want to retest but I’ve tested about 5 times (days apart) last week I still haven’t gotten my period I’m 21 days late I’ve either just skipped one cycle or somethings up 🤷🏻‍♀️

What could be going on here.i don’t even think it’s possible to be pregnant ?? Someone help