16dpo no AF

I'm TTC. I got a bfn the morning of September 16th using a digital first response test 12dpo. I am 16dpo today September 20th. I am nauseated off and on been having Diarrhea all day after being constipated for at least a week TMI. My cm has remained white and creamy and has gotten thinner over the last few days. AF is now 2 days late. I've got cramping in my lower stomach and lower back mostly on the right side for the back cramping. I have sensitive heavy breasts and I've been super bloated and feel like I can't get full so im constantly snacking I've been running 99.8f to 100.5f every day for about a week now. I took a hpt this morning but I think it's negative. I think I see a super faint line but it could be my eyes tricking me. Can someone explain to me what could be going on? I see the doc on the 23rd.