You asked

Spotting but too early for my period: does it mean that I'm not pregnant?

Light spotting, lasting perhaps a day or two, can be a sign of early pregnancy. This is called “implantation bleeding”. A few days after conception, the fertilized egg starts to attach itself to the wall of your uterus, getting ready to grow. The uterine lining is thick and rich with blood and the action of the egg attaching to the wall actually causes a bit of bleeding, which you observe as spotting. This is completely normal and is not a cause for concern. A pregnancy test and a doctor's visit will confirm whether or not implantation is the cause of the spotting.   

If you find yourself bleeding heavily (not just spotting) or it lasts for more than a couple of days, if you have bleeding during later stages of your pregnancy, then see your doctor immediately. This could be a sign of a miscarriage or an ectopic (“tubal” pregnancy where the egg attaches itself to the inside of the fallopian tube) pregnancy, which is a medical emergency.
Don't forget to look for baby names... Search now

More questions

The best timing for pregnancy testing is once you miss your period.
Ectopic pregnancies are fertilized eggs which implant themselves outside of the uterus. They must be terminated and can indicate future fertility issues.
Ovulation is the period during which you can conceive. Tracking ovulation can be tricky, but you can increase your chances of conceiving through math, prediction kits, or simple scientific observation.
Implantation bleeding is not a common experience, but some women do report small amounts of blood with or without cramping roughly a week or less before their anticipated period.
Pregnancy tests are only as good as the execution. Read all instructions to avoid getting inaccurate results on a home pregnancy test.
The best over the counter kits measure luteinizing hormone (LH).
There are many things that you can do to increase your chances of getting pregnant.
How STD’s can affect your pregnancy, your baby and how you should deal with them during pregnancy.
Taking care of your body before and during pregnancy
Ovulation occurs just about two weeks after the first day of your period.