Here is the translation of the given content into English: "Several months for Down syndrome screening"

Patient's question:

I am 3 and a half months pregnant, can I do the Down syndrome test? I am 3 and a half months pregnant, can I do the Down syndrome test?

Doctor's answer:

Disease Analysis: Hello, you are undergoing a Down syndrome screening between weeks 16-20 of pregnancy.
Guidance: Hello, Down syndrome screening can be performed between weeks 16-20 of pregnancy. Wishing you and your baby good health!