Probably not. Wait for a few more months and then see a doctor if it still hasn't come back
No, a period and a negative HPT (used at the appropriate time) indicates no pregnancy.
No
stress
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.
Malnutrition
well there still is a possibility that you could be pregnant if your period is irregular. i would suggest that you take a pregnancy test. if that comes out negative then go to the doctor because it might be something totally opposite of what you think
Most likely your period. You're probs not pregnant.
. . . means that you arent pregnant.
Yes
Spotting does not cause pregnancy. I assume you mean "does spotting indicate anything other than pregnancy?" The answer to this is, of course, yes. Spotting could indicate spotting. It's probably you period being finicky, or something along those lines.
Missing a period has many causes besides pregnancy. Many women (especially adolescents) have irregular periods to begin with. Stress, illness, and poor diet can also cause missed periods. See your doctor if this continues. One missed period is not cause for panic.
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.