What test should I get

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The daily ones aren’t really working for me . The strips I mean it’s hard to see the difference and my app isn’t picking up much difference. Should I buy the smiley one that shows four piss days ? Or that expensive phone test strip thing . My temps don’t vary enough either to show me . Also it’s hard because I work in healthcare and I am often fighting bugs and I get fevers off and on quite regularly due to my high exposure.