Help!! Am I pregnant or not??

Okay so my period was due 11 days ago and never came. For the past 3 days I’ve had sharp pains in my lower abdomen and lower back pains, my breast are horribly sore, I’m getting horrible headaches all the time, I’m always tired and hungry and I have to pee all the time. So I figured it sounds like I’m pregnant, but I’ve taken THREE pregnancy test and they have all came out NEGATIVE. But if I was to have gotten pregnant it would have been the week my period was due, because with our schedules that’s the only time we have had sex since my last period. Is it just too early to tell?? Or is my body just being weird??? Now my period is not always on time, I’ve went months without a period before, but this feel different.