Can i take a pregnancy test 13 days after sex ?

Yes: That is a reasonable time to allow (+) if happening, as usually see result 10-14 days after conception.

Take a test : Home pregnancy tests are very accurate. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection.

Yes: If you had unprotected sex, and were in a fertile stage of your cycle, you could be pregnant and the tests are very sensitive to b-hcg which is produced when pregnant.