Advice ?

Do bbt really mean anything? So my last period was august 21-25 I have a 31 day cycle very regular. My fertile window was 1st-6th or 2nd-6th or 2nd-7th. Ovulation day possibly could’ve been the 6th or 7th . I had intercourse late night on the 4th leading on to the next morning the 5th I also had sex again. So the 8th I had spotted . Since the 8th I have had mild cramping not crazy or anything. I would either be 6dpo or 5dpo right now . Yesterday 9/11/2021 I decided to check my bbt 🤷🏽‍♀️ since it’s been a few days since ovulation I just decided to check and yesterday night it was 98.5 and this morning on the 9/12/2021 it was 98.8 . I don’t know to much on bbt but how would my temperature be if I was pregnant if anyone knows?