It's more or less standard. _Any_ new drug is highly likely to exclude certain classes of people. This is particularly the case with vaccines where the risks of excluding a small number of people are generally low, as you're relying on herd immunity anyway.

I'm not sure if this was talked about before, but the fact that (like basically every vaccine ever) it won't initially be available to pregnant women was certainly talked about ahead of time. This isn't a fiasco; it's normal.