A bloody pregnancy test? If you don't have your period then is there blood in your urine? If there is you could have a bladdar infection or worse and you need to contact a doctor. Besides that, it is possible to be 3 days "late" and be pregnant because you could have simply miscalculated the date of your next period or the HCG (pregnancy hormone) could not be high enough to register on a pregnancy test yet.
the chances of being pregnant are less the 1 in 500.
Pregnancy tests are not 100% accurate, but being that it was negative and you got your period, I'd say you are definitely not pregnant.
You can get pregnant a week before your period, the week of your period, and the week after your period, and some pregnancy tests are faulty.
Who's pregnancy test? Yours?
If you are not pregnant, yes.
The negative pregnancy test is the defining answer, regarding pregnancy - once your period is a week or so late - if you are pregnant, the hCG will be high enough to be detected.
. . . means that you arent pregnant.
No you can't be pregnant and still have your period. You can have a light bleed but not a period. As for the whole negative test thing, it could be a false negative.
You are pregnant
Yes
Depends. Why aren't you having periods? A period is not necessary for pregnancy. Some women are "constantly" pregnant; that is they get pregnant after each birth before they have a period. (Each period is the result of not getting pregnant.)
Most people have a last period before they are pregnant. Some even have a period while they are pregnant.
Unlikely - the bleeding probably was your period