Body temp and early pregnancy

Hey ladies,

How long should higher temps last to know you're pregnant. I've had temps daily where its 99.0-99.03 or higher earlier it was 99.5 even shortly after getting up in the morning. I understand bbt I've done that before just curious how my of you had this in early pregnancy I am praying I'm pregnant now as I'm 34 with pcos. I have this missed period so I'm late for me as I have regular monthly periods but have fully missed this one. I have achy boobs only want food that is easy on belly lately. Any feedback would be amazing thank you ❤❤❤