no period negative tests

so i was supposed to have my period 1 week and 4 days ago but i haven’t. and i keep taking pregnancy tests. i’ve taken almost all of the ones that i can think of and they’re all negative. i’m confused and worried because i do feel nauseous all the time and i’ve been having very sensitive breasts among many other symptoms.

a friend recommended me to take a clear blue digital and i did, i took both the clear blue and first response. i’m lost at this point. i’ve called and scheduled an appointment with my obgyn but it won’t be until the 17th of july. i just want to know if any of you have ever had this problem? or should i just get a blood test?...