After a day can a pregnancy test tell your pregnant?

No. You need to wait at least 14 days after intercourse to see if you are pregnant. To ensure the best results for a home pregnancy test:

• Take the test in the morning, if possible, because your hCG (pregnancy hormone) levels are at it's highest
• Don't drink a bunch of fluids before taking the test because it will dilute your urine and can affect the results
• Take the test no more than 1 day before expected period. OR 14 days after intercourse (sex). Although some test say that you can see results up to 5 days before your missed period, the percentage of accuracy is very low.
• urinate for as long as possible on the foam-like strip
• Check the results in the window frame of time suggested by the instructions of the pregnancy test.