If your kitten's tail is longer than this, it does indeed have a proportionally long tail. I was unable to find any information on longest tail on a domestic cat. I even searched the Guiness Book of World Records to no avail. I am afraid this is one record that no one ever though to keep.
Blighted ova are the cause of nearly half of all miscarriages that occur during the first trimester. Diagnosis of a Blighted Ovum. Examinations conducted on pregnant women early in pregnancy will seldom detect a blighted ovum, even with ultrasound. It is only later, after the baby is supposed to have grown large enough to be visible (which should be by the sixth week of pregnancy), that a diagnosis of blighted ovum can be made.
A blighted ovum occurs when a fertilized egg implants in the uterus but doesn't develop into an embryo. It is also referred to as an anembryonic (no embryo) pregnancy and is a leading cause of early pregnancy failure or miscarriage. Often it occurs so early that you don't even know you are pregnant.