Some of the best answerers on the site wrote back to your other post and explained that you didn't get pregnant by the guy who wore the condom and pulled out and didn't ejaculate, and told you to stop worrying. They assessed your dates by your ultrasound results and told you not to worry. In your shoes, I'd go with what your doctors have told you and a little common sense, and turn a deaf ear to more iffy sources, like your psychic. See a therapist. Try to dump the guilt.