Charting bbt of 98.0 or higher?

Has anyone maintain the 98.0-98.6 (or higher) range and found out they were pregnant? I'm 8 dpo and I don't temp or chart but I'm pretty sure my temp isn't this high on the regular... Is 98.4 or 98.6 even high enough to predict pregnancy? If I can remember correctly, my normal temps are in the 97.0 range.  I've looked at other people charts and a lot of women who found out there were pregnant barely broke 98.3. Maybe a couple actually reached 99.0.