Doctors started using more modernized pregnancy tests in the 1960s, just in time for the onset of free love. Scientists used purified hCG to test a woman's urine sample and observe how the antibodies reacted with the hormone. The test wasn’t always that reliable depending on the variables of the urine sample, so false-negatives and false-positives started popping up.
But where would we be without false pregnancy tests? It’s the stuff TV shows are made of when they decide to jump the shark.