Hello lovely ladies!

I just have a quick question...
Do you POAS before your b/t with IVF? I have my b/t this Friday 27th which will be 2 weeks after collection. Am I a lunatic to POAS before?
I don't know what would be worse

a. A BFN
OR
b. The 'Oh we are really sorry but....' phone call Friday afternoon.

What do you usually do??

TIA