I'm so sorry for your great loss.
It looks like your coverline should be at 97.3 and you probably O'd on CD 10 or 11. Your temps are well above the coverline (if set at 97.3) and they definitely don't look "too low." I temp low as well so I do understand your concern but your chart really does look good! Best of luck to you.
I am sorry. I lost my son the same way. He only lived a few hours. If you've checked your thyroid, I think it's fine. I temp low too.