Hypothetical question about the Pro Life stance

[Plissken]

As I understand it, the basis for the Pro Life argument is that even a zygote is human life, and that ending that level of cell division is murder.

We'll skip all of the scientific questions this raises, as I'm more concerned about the ethical and moral questions this raises. So here we go:

Say that you and your spouse have been trying to create a second child, to complete your family. Due to some unforseen difficulties, you have begun the process of invitro fertilizations. While at the clinic to select the zygotes with which your wife will be impregnated, with your wife and first child, a fire breaks out. Your wife and the medical staff escape unharmed, but you, your child, and a tray containing 20-30 of your zygotes are surrounded by flames, and you can only carry out your infant child or the tray of petri dishes.

What do you do, and why?