Wait one week (if you can, if not a few days) then take another test prefferably another brand in case something was wrong with that test. If it is still negative call your doctor. He can send you for a blood test. There are two types of blood pregnancy tests. One only gives a positive or negative, the other (Quant) tells your hgc levels. This is helpful because it tells how much of the pregnancy hormone (if any) you have which can help determine how far along you are. If the test is negative your doctor can then determine the reason for your lack of period. (It can be many things including stress, fibroids, ovarian cycts or your body is just being wacky right now.)
It means you are either having a very light period already, or it is still coming.
No, a period and a negative HPT (used at the appropriate time) indicates no pregnancy.
No
Most likely your period. You're probs not pregnant.
. . . means that you arent pregnant.
Yes
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.
Unlikely - the bleeding probably was your period
Having your period means you aren't pregnant
You are pregnant
Yes. Take a pregnancy test if you miss your period, or have missed a period already
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.