The light color on the T that is test line is called as weak positive pregnancy
The weak positive could be due to very early pregnancy or may be due abnormal pregnancy.
So, i would suggest you to consult gynaecologist and get yourself examined and evaluated.
You will need to do the blood test
of pregnancy that is B HCG
levels, the growth pattern of the b HCG levels and USG to be sure about normal pregnancy or not.
Hope this information is helpful.
Dr. Mrs. Sumeet Baheti