You could have gotten pregnant on your period
Not normally
yes
Yes.
Get tested. I believe it is possible, so just get tested.
No. If you still have you period, you cant be pregnant.
this means you are no longer pregnant. you were either not pregnant, or you have lost the baby.
If you had unprotected sex you could be pregnant, if you are still concerned take a test.
Even in the presence of bleeding, you could still be pregnant.
Not having your period but spotting is int unusual during pregnancy.
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.
If you really had a miscarriage, you can't still be pregnant, but you could be pregnant again before you get your next period.