First response hpt help!!! I'm so confused!!!

Yasemin • Married to wonderful hubby! Have two gorgeous girls 16 and 9. Trying for number 3.
My AF was due yesterday and it didn't come. I tested with the digital one today and it was bfn. It came in a two pack one with lines which I used Friday and got bfn and the digital yes or no one today and got bfn again. I'm never late I've been 26 days for a long time what could be going on? Someone please help as I'm so confused.