To test or not to test?

I'm stuck between wanting to test and being scared to death to see yet another negative test. For some ridiculous reason I think testing too soon will somehow jinx the results (I know I sound crazy.) I've been nauseous/vomiting for several days, tearful for no reason, sore boobs, backache etc but the unfair part all those symptoms could just mean my period is on its way. Ugh this trying to conceive thing makes me a hot mess. So do I wait until I'm late or go ahead and test early? What day past ovulation is best to test?