is there a chance of pregnancy outside fertility date

Hi! My husband and I are trying to get pregnant so I have been using this app to track my fertile days. Last month we did it 3 days after my menstruation which is also 3 days before my fertility period. Now Im 2 days delayed. Is it possible that I'm pregnant? I dont wanna take the test yet baka kse ma disappoint lang ako. 😢Meron bang nabuntis dito with the same case?