first time ovulation test user

i usually get some ovulation cramping but i just want to confirm it. should i test when that pain starts or like a few days before. the app is usually either right on or a day or so off from when i get the pain. also how long after a positive do i have to do it. me and my partners schedules are crazy this upcoming week so i’m not sure if we can on that same night.

is morning or night better?

just any tips please