Sandygirl - Thanks for your help. I've been googling about it and found that most searches said what you are saying, it's a booster and not completely necessary. I'm just so scared of stuffing it want to give my two little embies the best chance of survival. I've decided to go ahead and take it tonight, get more on Monday and hope I've done the right thing. How did you go with the puffing last night?

Nikki - I'm just one day ahead of you in the TWW. Let's worry together! lol!