19 days late and in pain

Well today I am 19 days late for my period and I have gotten 4 negative tests (the last time I tested was last Saturday) and starting yesterday I've had a pinch in my lower back on the left side pretty constantly and today when I got up from a chair my lower stomach got a sharp pinch/muscle pull type feeling all across my ovary area. It hurt really bad! Now it's just pinching in random areas near my low stomach and back. Should I test again? Or wait till I'm a month late and go to the doctor? I'm so confused I've never been this late or had these pains