BBT charting and ovulation

Can someone please explain to me about tracking bbt and how you know if your ovulating the same day of your ovulation test or not.. I've never tracked bbt and want to add that into the things we check. I know to take it every morning before getting out of bed but do you test every morning all month or just your fertile week? Can you use a regular thermometer? Also, I've been getting positive OPKS but I see people say "I ovulated early Friday morning" .. how do you tell? My tests just say if you get 2 lines you will ovulate within the next few days. I usually get a positive opk around the same day every month and try to BD the day before that, on that day, and the day after.. but not having any luck. I'm still new to this so any information would help! Thanks in advance and baby dust to everyone!! 😊😊