Af has not arrived yet

Desiree • I'm a stay at home mom of four, and currently trying for a brother my eldest son who is 9.im a married women of three years, and I have three beautiful daughters.
I'm not two days by my count but by the app I'm due to start the 27th but I don't feel menstrual I feel off and nauseated and boobs hurt... Idk if I should test or not the app says to but I've been hearing negative feedback on it as well as positive anybody here two days late at least and got a positive?