My calculations bring it out at 16st 1.9lb hun...
This would mean you've lost 21lb and I used both an online kg to lb converter and the Microsoft Excel spreadsheet that got posted a while back.
Your pharmacist is wrong.
Saying that, my pharmacist is often wrong so I just smile and nod when they tell me what I've lost and then go home and work it out myself as I know it's right then... xx