Patient: Can a doctor tell if you are only 5 or 6 days pregnant?

Doctor: 5 to 6 days after conception might be too early to diagnose and false negative results might increase. After the 7th day post conception the chances of having a valid positive result increase.Implantation of the embryo is usually done at a week after conception and even with an experienced ultrasound technician there still be a chance of having a false negative result.