14. Mustard powder
This test works a little differently from some of the others in that no urine testing is required. Mustard powder has many uses, one of which is to regulate the menstrual cycle. It can also be used to determine whether a late period is due to pregnancy or other reasons. There are many different reasons why a period could be late, such as changes in diet or hormonal imbalances.
To use mustard powder to test for pregnancy, fill a bath with hot water and add fresh mustard powder. Mix it into the water thoroughly with your hand until all the particles are dissolved. Once it is dissolved, soak your whole body in the bath for about 15 minutes. After this, take a shower and wait until the next day. If you begin menstruation, the result is negative, and the delay was due to some other reason. If there is still no sign of your period, you could be pregnant. The reason this test works is because it raises your body temperature.
In the 1950s, if a woman wanted to know if she was pregnant, she could have her urine injected into an African clawed frog. The frog acted as a living pregnancy test, and if it laid eggs between five and twelve hours of being injected, the woman was pregnant. This test was faster and better than other tests which involved the deaths of mice, rabbits and frogs.
The use of frogs was slowly abandoned, but it was the frogs that turned pregnancy testing into a large-scale endeavor. Tens of thousands of frogs were injected with human urine in the 1940s and 1950s. Stocks of the African clawed frog (Xenopus) popped up all over the world as they became the very first mainstream pregnancy test.