After having intercourse, it is recommended to wait at least 10-14 days before taking a pregnancy test. This allows enough time for the fertilized egg to implant in the uterus and for the hormone hCG (human chorionic gonadotropin) to build up in your body. Taking the test too early may result in a faint or negative result, even if you are pregnant. It is important to follow the instructions on the pregnancy test kit and use your first-morning urine for accurate results. If you receive a negative result but still suspect you might be pregnant, wait a few more days and retest. If you continue to have doubts or concerns, it is best to consult with your healthcare provider for further guidance.