It’s been three weeks now…

It’s been 3 weeks now and still haven’t had my period. All my at home pregnancy test are negative.. I tested 6x.

Still having milky/creamy discharge and feeling bloated most of the time and hips feel heavy. I went to the GP and they said maybe I am just stressed. They did not do any blood test since I dont have any other pregnancy symptom. Still feeling a bit paranoid.. Can I rule out pregnancy in this case? Is it possible to really skip a menstrual cycle?