No, a period and a negative HPT (used at the appropriate time) indicates no pregnancy.
Most pregnancy tests are 99%
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.
It will be negative because you are not pregnant.
You are pregnant
Who's pregnancy test? Yours?
Possibly the pregnancy test is ineffective. Try another one.
Unlikely - the bleeding probably was your period
Having your period means you aren't pregnant