Hello,
Thanks for me joining on ehealthforum.
The faint line that you saw in your UPT (urine pregnancy test) could mean pregnancy.
Sometimes the concentration of the HCG (pregnancy hormone) in urine is less resulting in false negative results (test shows negative even though you are pregnant).
Report to your gynecologist/healthcare provider and get a blood beta HCG test done along with a pelvic scan to confirm/rule out pregnancy and also to see if there are any other reasons for you not having your periods.
All the best.