Need help: desperately

I have a very dumb question. I used to be on the pill for 2 years-- I stopped taking them last December since we wanted to get preggo. Since I stopped it until now, NO PERIOD at all. I understand my body is still trying to normalize. I still used the app even while I was on it to just keep track of my period. I use to track my ovulation with the app when I stopped the pill but since I am late for like 91 days now-- it won't predict my ovulation anymore.

I just bought the ovulation strips since we really want a baby now but aside from not knowing what to do, I DON'T KNOW WHEN TO START TESTING. :(

Please help. Sorry if it sounds so dumb. Thank youuu!