Confused! Help!

So, me and my SO have been trying to get pregnant. AF was due the 17th. Never showed. Still hasn't shown so I think that makes me 8 days late now. All tests have been negative. Should I wait it out and keep testing, go get a blood test done or what? Is it possible that I'm pregnant even though I'm getting - at 8 days late??? Please help!

Side note:

I've had symptoms as well

Bloating

Nausea

Headaches

Burning up off and on

Lower back pain

Random cramping

Increased urination

But no sign of AF. Not even any spotting after sex, which usually starts it up for me if I'm due for it