Will your doctor be able to know whether or not you're pregnant a week after you've had unprotected sex?

It can take up to FIVE DAYS after sex for conception to even happen.  (sperm can live for five days and wait for an egg to arrive - conception does NOT always happen ON the day of sex.)

After conception, it can take between SIX to TEN more days for implantation to happen.

There are NO pregnancy hormones until implantation happens.

A pregnancy test at one week could be a false negative.  

A positive test at one week is unlikely unless conception happened within a short time after sex and implantation happened within the first six days.  It would need to be a blood test.  A urine test would not be sensitive enough.  

No. But there are pregnancy tests in the drugstore that can detect pregnancy pretty early. If you have an appointment with your doctor and are worried about this, no, the doctor won't know from a regular examination whether you're pregnant. They have to administer a specific pregnancy test, with a sample of your urine. 

No.             

No. That's too early.