A blood test is fool proof.
Actually new kits are as well, but a blood test will not make a mistake.
There are many reasons you can be delayed a day, including infection.
Stress, weight change, hormonal changes, all can to it.
So see your doctor for an exam, have a blood test to rule out pregnancy.
OK, let me know if you have more questions.
This is concerning because it can be any one of several issues.
Temporal mandibular joint syndrome. A form of arthritis in the jaw.
Early trigeminal neuralgia: this is a nerve problem and can become extremely painful. Often a surgical procedure , minor, can relieve it.
The beginning of bells palsy, which can leave the fact paralized on one side.
I would see the neurologist asap.
Let me know if you have more questions.