I had sex exactly 8 days ago.. and on day 7 i started to see brown spotting.that went a way this morning. had sex when my period went off 8 days?

Pregnancy worries?: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. If a woman gets her normal regular period, then she is not pregnant, and a test is not needed.