AF DUE THE 4th OF MAY!?

Leny • Thankyou GLOW #1 coming soon!!!!
My AF is due on the 4th of May, Hope to have someone with the same cycle as me. Its the 20th of April, is this what they mean by TWW? cuz theres 14 days until my AF...sry, I cant seem to understand when the TWW occurs. Ty for taking the time to help and for your comments. ;)