I am two weeks late on my period. Ive had my period for 20 years now and never have I missed a period. I tested three times, the first two times was day 1 and 2 of missed period and the last time was about 3-4 days ago and all negative. Recently I’ve been experiencing motion sickness while in the car, slight backache, mild cramping, and headaches out of this world. What is wrong with me? Help please!