daveansh,kuch to bolo yaar.
Internal mechanism of antibody production does not have a wall calender hanging inside. 11 week or 12 week, does not make much difference. If you are "negative" at the end of 11th week, you are safe 100%. You don't have to retest after a week later, it is as good as 12/13 week test.
Bhai Davenash nahin hain to hum ne bol dia na. Chalay ga?
bilkul chaleyga bhai mere.