For the past 5 mths my body been going through changes my cycle come on when it want to will stay on for no longer than 3 days mild back pain, nauseated at times, appetite comes n goes, headaches, fever running bout 99-100, at times i feel movement in my stomach lil funny movement , and the crazy thing to all of this is my sis n law is pregnant and im feeling nearly all the same symtons she have. just unusual symptoms i have kids but dont remember any of these signs for pregnancy i went to the Dr took several pregnancy test and it all comes back neg. Really unsure what to think Can somebody help me plz.