dollerstore tests?

do you think these are really accurate even when they claim to be 99% on missed period day. Took two 1 day before af & 1 right in the morning of af day. Both negitave. Had no pre af symtoms still dont & no af but i got the bigger looking pregnancy boobs i really believe that i am & that these types dont work for me. Maybe i need to go to the clinic & test.