Everything normal, can’t get pregnant

Has anyone had experience with everything being totally normal, but still unable to conceive? I’m talking perfect - 27-28 day cycles, ovulate (know by tests and mucus) around day 12-13, no PCOS or cysts or endometriosis and STILL. NOT. PREGNANT. after 2.5 years? It just seems crazy and I’m beyond frustrated. I cry all the time and am so emotional and fed up and tired of fertility tests that come back clear.