Take a pregnancy test.

A pregnancy test is a diagnostic tool used to determine if a person is pregnant. It typically involves testing urine or blood samples for the presence of a hormone called human chorionic gonadotropin (hCG), which is produced by the placenta shortly after fertilization. The test can yield either a positive result (indicating pregnancy) or a negative result (indicating no pregnancy). These tests are available as over-the-counter kits or can be performed by medical professionals.