TTC while sick

Ok ladies I need some help? I first got sick on Sunday, it’s now Saturday and I’m finally starting to feel better but my period was supposed to start on Monday. I took 2 at home pregnancy tests (One on Tuesday night and one on Wednesday night, both negative) just to make sure it was ok to take medicine. Im officially 5 Days late and still no period. On a side note I’ve been tracking my period on glow since October 2016 (when my husband and I decided to start TTC) and it’s always been accurate. Any advice?