Disclosed herein are methods, for use in association with specially configured devices, systems, and kits, for performing immunoassay tests to detect for at least progesterone or analytes of progesterone on a sample in association with diagnosing problems and issues associated with corpus luteum functionality. The immunoassay devices and methods may be used in conjunction with diagnostic reader systems and/or a base unit for obtaining a sensitive read-out of the immunoassay results. The immunoassay devices and methods may utilize a competitive binding-like assay and a sandwich binding assay to detect at least progesterone or analytes of progesterone in a sample.