I don't want to go to the doctor, until I get a positive test.

If you're still getting negative results a week after your missed period, you can probably rest assured that you're not pregnant. Periods tend to be pretty sensitive to stress, and if you're stressing over this, it's likely that's what's causing your late period.

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Well first up, have you had any unprotected sex since your last period?

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Yes. That's why I'm over here tripping out.

Also, did you take the four tests at the same time or on different days?

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"Better to remain silent and be thought a fool
than to speak out and remove all doubt."

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It really doesn't matter how reliable your period is, it still doesn't mean that it'll always come on the expected day 100% of the time.
I'm assuming that you did have unprotected sex sometime before your expected period, since you're concluding that you must be pregnant. But your cycle can be thrown off by so many things it's ridiculous.  
Are you taking or have you recently switched birth controls? Have you been feeling particularly stressed lately? Have your eating habits changed recently?  
All those things and more can mess up your cycle. If you're truly concerned that you are pregnant, then the best thing to do would be to see a doctor about it and they can test you properly. Pee tests can often produce false-negatives and false-positives, as well they positive may be very weak so it might take a closer look.  

Also, did you take the four tests at the same time or on different days?

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My period has never been late before. I don't take birth controls, I'm not stressed actually happy and excited for my vacation this month, and no..
I took them all on different days, in the morning. I had my boyfriend buy me the 4 pack. I did drink beer this weekend.. I don't know if that will have an effect on the test or not.

So chill out. If you've taken 4 tests, short of going and having a blood test, they doctor will also run a urine test which (if negative at home) will also be negative. Wait a month. All kinds of things can cause your cycle to get thrown off balance.

If you still haven't gotten your period in two weeks, take another test.  If that's negative, and your period is still MIA four weeks from that, see a doctor.

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Cops are wonderful assessment tools at a HazMat incident.
Send them in with a lit road flare.

If they don't pass out or blow up, it's safe.