Pregnancy test strips are highly accurate (about 99%) at-home devices that detect the human chorionic gonadotropin (hCG) hormone in urine. To use, dip the strip into a collected urine sample for about 5–10 seconds (or follow specific brand instructions) and wait 3–5 minutes for results. For highest accuracy, test using your first morning urine after a missed period. [1, 2, 3, 4, 5]