Pregnancy scare?

Kacie • Periods sux
So me and my boyfriend have been together for 6 months and have not had sex but we "mess around". We do oral and fingering and blah blah blah. Anyways, I understand  it's nearly impossible to get pregnant from what we do and how careful we are, but I'm still so nervous! Mostly because at the moment I'm 8 days late and no period. I've had these weird feeling cramps and I've felt nausea and I pee 24/7 lately. 
The weirdest part is that I took a pregnancy test 5 days ago and it said "not pregnant"?? I've been under lot of stress lately which could be a reason for the delay but still doesn't explain the "symptoms" I've been having? 
​Talking to a doctor or a parent is out of the question and I have no clue where to go from here. Help:(