DPO 6-8: High Bbt or low grade fever?

[mrsz24]

Hi ladies! Any charting advice would be much appreciated. This is my first cycle charting, and my temp spiked to 99.3 on dpo 6 after dipping on dpo 5. DPO 7 and 8 were just as high with this morning being 99.63. I've also had the worst headaches, nausea, and dizzy spells. I take my temps at the same time every morning, but I'm curious if I should treat this as a low grade fever rather than just high bbt. Anyone out there with temps this high?