How do you know that you were pregnant? You cannot rely upon your intuition alone, especially if you are not sure if your period was normal or not?! I can't give you a correct answer at this time because you are not giving me enough information about your previous period (date,duration) or the results from previous pregnancy tests. If YOU WERE PREGNANT (positive pregnancy test with an ultrasound confirmation) and your FETUS DIED BUT WASNâT EXPELLED FROM THE UTERUS (MISSED ABORTION), your pregnancy test will become negative 1-2 weeks after the fetusâs death.