Did 1 week pregnant will miscarriage by having a sex?

Ok, not really able to understand,

Are you asking if you miscarriaged, you were one week pregnant.

First at one week, there is no way to know if you were pregnant or not,

If you did, it would be hard to tell One can not even tell they are pregnant till after they miss a period and would be 4 or 5 weeks.

Why do you believe this ? IF in doubt, you can always go to your doctor