One of the earliest pregnancy tests discovered by archaeologists comes from ancient Egypt. Dating from approximately 1350 B.C.E., women would take a bag of whole wheat and barley and urinate on it. If the seeds germinated, it meant the woman was pregnant. The science behind this method is fairly simple. A pregnant woman’s urine contains elevated levels of the hormone estrogen, which can stimulate seed growth. The Egyptians believed that if the barley sprouted, the child would be male and if the wheat sprouted it would be female. Interestingly enough, a test conducted in the 1960s revealed that the test was 70 percent accurate.