4 days late negative test??

According to glow I was supposed to start 4 days ago, I am not on any form of BC and my fiancé and I have been TTC since last November 2018 after i had a miscarriage. Although i know glow isn’t always spot on with the period tracking I am never late more than 1 day from the expected period date. My boobs were pretty soar last week but have been feeling back normal since the day I was expecting my period. I took two clear blue test the day after I was expecting my period and test were both negative. Is this common?? Is my period seriously going to be a whole week late?! Or is it even possible for me to be pregnant right now ? Help!!