I need help !

So I got my last period at the end of February going into March. About a week later when it was done I started getting the worst cramps for like a week straight and now this month I haven’t gotten my period and it’s two weeks late. Lately I’ve been extra tired and my appetite has been up and down one Minute I’m not hungry or feeling bloated the next I’m starving and eating more than I usually do. I’ve taken 2 or 3 test with in this month and the last one I took yesterday and they all were negative. What do you guys?! What should I do?! BTW my period is not usually irregular.