1st time TTC, not sure what to expect..

Rosemary
I haven't charted my ovulation, just my regular period, which is generally spot on with both glow and 2 other apps. My period is 8 days late, and I'm feeling what I usually experience with my period(cramps, bloating, sore breasts,etc). 
But in the 16 years I've been hosting AF I've never felt as nauseous, let alone as much as I have in the last 2 days. I think the worst part is that any coffee I've had today tastes rancid, regardless of where I got it from. 
My CM isn't isn't AS  thick as most pictures that I'm seeing to indicate pregnancy but it's also not egg white either. 
I have taken 2 HPT's in the last week but they were negative. Just because the nausea was bothering me so much, last night I took another one--negative again. 
Is it possible that the HCG hormone is too low to give me an actual positive? Or is my body just having a fit and messing with my emotions?
Any input, advice or help would be greatly appreciated. 
Thank you ☺️