Is there a new site hook?

Hello,

I was wondering if anyone can either point me to the right direction or answer my question. I wrote a plugin and need to run a function to check a few things before a new site is created. I tried ‘wpmu_new_blog’, ‘activate_blog’, and ‘wpmu_activate_blog’. None seem to work.

Is there a hook for whenever the superadmin create’s a new site?

Thanks!