So sorry for both your losses.
Debbie, I know though it hurts you will carry on in your typical fine professional fashion.
"Helen" I hope this doesn't put you off. Despite being a beginner, when you knew something was going wrong you really tried your best to save the little guys. You will make a great cham-mom. Addict yourself to this forum, read as much as you can, then get back in the saddle! (Choose a forgiving breed. After research you will know!)
If you can, buy from a reputable breeder instead of someone who just wants to move PRODUCT. Only buy your new baby AFTER fully setting up it's home (something to do with that £50)
Good luck, carry on, you did the best you could.