Are there any issues with taking a pregnancy test (non-electronic) on Shabbos?
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Rabbi Abadi says it is permitted; here:
One issue with taking such a test is tzovaya, as usually the test involves chemicals in the stick changing colors by reacting to the urine. R' Ribiat, in 39 Melachos, with regard to clinical test sticks used by diabetics to determine urine-sugar level, cites Sh'miras Shabbos K'Hilchasa (33:20), who is unsure about this (see footnotes 81-83 there), and recommends that one not urinate directly onto the stick, but rather such that the urine comes by way of g'rama onto the stick.
For practical ruling, though, CYLOR.