India, it is possible, but to put your mind to rest for sure, go get a blood test, it is 100% accurate in telling you if you really are pregnant.
The other possibility, is that you had a chemical pregnancy/misscarraige, and that the hormones are just high enough to still cause a faint line.
Noone can tell you for sure hun, only your doctor can.
Best of luck though that this IS a BFP, and a sticky bubba!!