Nowadays, finding out if you're pregnant is relatively easy — but it wasn't always that way. Over the centuries, people have come up with downright strange and sometimes revolting tests to figure out whether or not a person is knocked up. Some of them were useless, some required being a chemist in the bathroom, and some caused major ecological disasters.
The thing about pregnancy, as a condition, is most people eventually figure out their status on their own. Pregnancy tests, for much of history, have seemed unnecessary.
Still, people have always tried to find ways to peek inside themselves. Some people want to make an early announcement to family. Some need to put their names on a six-year-long waiting list for a private kindergarten, and hope that a year's worth of kids drop out of the running. Some just wish to experience the sheer joy of peeing on something scientific. Whatever the reason, all those who grab a stick and run to the ladies' room are participating in a long, occasionally-destructive, and sometimes outright loony march of scientific progress.