What do I do?

I took a test on Friday and my period was due Saturday. It was negative, and I still haven’t come on. Getting nausea but that doesn’t mean much to me. Just AF just messing around? We just had sex and my partner said I felt tighter than usual (tmi) does that mean anything? Probably not.. I wouldn’t say my periods are spot on every month either so I’m kinda in two minds! This whole ttc thing is sooooo draining. Constantly overthinking!