What day will I be late?

Emily

Hi 👋🏼 Glow says my period should start on Sunday, which would be cd36. I have entered all my periods in since last October. Some are longer cycles, some are shorter. They have been getting shorter though since I started taking Alani Nu Balance. My last was 33 days. I want to wait to test until my missed period but cd 36 seems a little late! Opinions please? 😊