I'm now a little more than three weeks late on my period. I've taken a test and it was negative. However I've been moodier than usual and almost everything makes me want to cry even if it's not sad! On top of that I've been very nauseous this morning and almost thrown up four times. And I'm always hungry especially at night and I find myself wanting sweet things to eat. At this I'm not sure if I should wait another week and take another test or try and go see my doctor