Is it accurate to use a pregnancy test 7 days after conception?

Patient's question:

No

Doctor's answer:

If the menstrual period is one week early or delayed, it is normal. With a history of sexual activity, if the menstrual period is delayed by more than one week, the first step is to take a pregnancy test to rule out pregnancy. Stress, cold exposure, environmental changes, or endocrine disorders can all cause delayed menstruation.