Help?!

****UPDATE*****

I am now 9 days late! Still no positive test!

I have however gone to the docs and they are sending me for blood tests to see if I am pregnant 😁

I am normally clockwork with when I am supposed to start... however I am 2 days late and have been ttc for a few months with my husband.... I took a test and it's showing not pregnant.

Should I wait a little while longer before doing another test? Why could I be 2 days late if I'm not pregnant?