Pregnant??

Tory
I've been really tired and been vomitting almost every time after I eat other than that I feel normal so I don't think I've been sick. I've taken 2 pregnancy test and both have been negative. My boyfriend still thinks I'm pregnant because he says I act really different now. I've heard you have higher chance of a more accurate outcome to take test in the morning? It's been a week since my period was due so I'm probably not pregnant? Just didn't know if someone kept getting negative even if they were pregnant ?