New to TTC really need advice please!!

According to my CM and glo I thought I had already ovulated I did not check my temperature because I'm not sure how that works I am what I believe to be 6 to 7 DPO I really don't feel well lots of AF symptoms with some nausea. I feel like I'm getting sick or something and my temp is at 99. I also have a big increase in my cm just wondering if this is normal in the DPO or if I'm ovulating now instead of when I thought or does it sound more like I'm coming down with the flu or something? Any advice with BBT when TTC is welcome.