 [ Symptoms ] i had a negative pregnancy test that turned positive later could i be pregnant  i took 2 more tests same night and both negative took another test next morning and negative having strange symptoms of nausea dizziness fatigue low grade fever and chills my period would have started on 112015 if on time for my 28 day cycle still have not had any bleeding but had cramping and migraine headaches around 112015 which is the usual symptoms for me during my period note worth also i stopped taking birth control in september 2015 [ Disease ] your body is designed to get pregnant when you are having unprotected sex with a man capable of fathering children and you are not using contraception it may only be a matter of time rather than repeated drug store pregnancy tests perhaps you should have your doctor order a more sensitive blood pregnancy test while any lab test can be false positive or false negative repeating the test in a week or so with a more sensitive lab test would most likely get you the answer or you can wait about eight more months to see if you have a baby