Coffee & pregnancy & nursing

Question for you mamas! I am a mom of 2 currently trying to conceive #3. Both times before I quit my morning cup of coffee cold turkey (1 cup in the morning is all I drink and don’t drink other caffeine filled drinks, just water) when I tried to add it back into my life after pregnancy, it hurt my babies tummies. So I didn’t drink it but neeeeeded it 😂

My question is... did y’all quit coffee while pregnant? If not, do you drink it while nursing and does it hurt your babes tummy? I’m wondering if I keep it in my diet while pregnant if it won’t hurt them while nursing.