It means you need to call your doctor. There can be any number of things going on.
The day I took a pregnancy test which said positive later that same day I got my period, which was light then it has gotten darker, what does this mean, and what should I do about it? Please help me out. Much appreciated :D
The most likely explanation is a spontaneous miscarriage, which is very common. Some women do experience light implantation bleeding, but it shouldn't seem exactly like your period.
What to do depends on if you are trying to get pregnant. If you are, it would make sense to visit your ob/gyn. It is a good idea to see a doctor before you try to get pregnant, so any lifestyle/health issues can be addressed (weight loss, weight gain, vitamin deficiency, etc.) before pregnancy.
If not, wait a week and test again.