I ate walnuts throughout my pregnancy and looking at my sweet baby now, I feel it was all worth it. They are super healthy, so eat them without any worry.
Honestly, I couldn't digest anything in my first trimester, but soaked walnuts were easy on my stomach. Just soak them overnight to make them easier to digest.
I totally understand how we worry about every little bite we take for our baby! Yes dear, walnuts are wonderful and safe, they will make your little one strong.