Thanks i didn't think it would but I have read alot of conflicting articles lol. I had anorexia fora very long time and though I am doing better now, I am still underwieght for my height. Thanks for clearing that up :)
The only things that I know of that can cause an HPT to be false:
-Cysts/tumors
-If you're taking medication containing hCG
-If you tested too early
-If you did not follow the directions
Your weight won't have anything to do with it.