Period was two day late having really bad cramp

Ashley

My period was two days late took a pregnancy test said pregnant but then show it had a error took two more the next day but was negetive. My period been really light when it normally really heavy. I been having the worst cramping and back pain of my life while feeling really nausea. Pain med, heat pad and my livia device is not helping. Is this normal and ok or should I go to the doctor.