Here is some information regarding the evening curfew:
People who need urgent medical care are not required to have a declaration in order to be in the street after 21.00h.
If and when you are stopped you will need to explain why you are in the street between 21:00h and 4:30h.
It might be wise to keep a declaration with you just in case, stating that you are pregnant.
Informal care providers (such as babysitters for the other children) do need to provide a personal declaration.
The declaration can be downloaded here