2 negative tests, no symptoms, but 3 days late

Katie
Ladies!!! I am beyond confused! I'm 3 days late (my period is like clock work) but have no symptoms. Maybe very mild nausea & no spotting,  but I work retail & there's always something going around. I took a pregnancy test on the 20th & 25th, both were negative. I used the Up & Up brand. Have any of you had similar situations??? We are in our 5th cycle TTC & im trying not to get my hopes up. Any helpful tips or advice????