Symptoms

Hey ladies first time adding a question.im 36 and trying ttc.  I think I'm driving myself crazy. For the last two weeks I've had terrible nausea, hound dog sense of smell, sore breasts. I've taken several tests of course coming out negative. I am due to have af anyday. When is the best time to test? We have been trying for about 6 months with no luck. Am I crazy? I have a 6 year old and never had symptoms with that pregnacy. I've also never had these symptoms in regards to one?