5 days late, negative tests!

My period is NEVER late over around 24 hours. I'm currently 5 days late, but every single test I've done is negative. I've had nausea which is really unusual for me, plus super tired and low back pain, and a bit of nipple pain which is unusual too.

I'm really convincing myself I'm pregnant as you hear so many stories that people didn't test positive for weeks after their missed period! Waiting is KILLING MEEEEE!!!!!!

What should I do? Bite the bullet and buy a digital (only done cheapies so far)? Contact my doctor? Or WAIT 😫