personally I don't believe in pantang. I would only tell my closest family members and maybe my employer, until after first trimester when the pregnancy has stabilised.
Not only about evil eyes, sometimes it may be devastating to break news again if you're miscarriage than breaking a good news not all mum able to process that emotion.
My doc personally told me to keep it a secret before reaching 4mths. Anything can happen, e.g miscarriage.
Bcos the first trimester was crucial, can let people know when your comfortable
It is mainly because the baby gets stable after 12 weeks